Bump pyinstaller from 4.6 to 4.7

Bumps pyinstaller from 4.6 to 4.7.
Release notes
Release v4.7

Please see the v4.7 section of the changelog for a list of the changes since v4.6.
Changelog
4.7 (2021-11-10)

Bugfix

* Fix a bug since v4.6 where certain Unix system directories were incorrectly
  assumed to exist and resulted in
  a :class:`FileNotFoundError`. (:issue:`[#6331](https://github.com/pyinstaller/pyinstaller/issues/6331)`)
Hooks

* Update ``sphinx`` hook for compatibility with latest version (4.2.0).
  (:issue:`[#6330](https://github.com/pyinstaller/pyinstaller/issues/6330)`)

Bootloader
</code></pre>
<ul>
<li>(Windows) Explicitly set <code>NTDDI_VERSION=0x06010000</code> and
<code>_WIN32_WINNT=0x0601</code> when compiling Windows bootloaders to request
Windows 7 feature level for Windows headers. The windowed bootloader
requires at least Windows Vista feature level, and some toolchains
(e.g., mingw cross-compiler on linux) set too low level by default.
(:issue:<code>[#6338](https://github.com/pyinstaller/pyinstaller/issues/6338)</code>)</li>
<li>(Windows) Remove the check for the unused <code>windres</code> utility when compiling
with MinGW toolchain. (:issue:<code>[#6339](https://github.com/pyinstaller/pyinstaller/issues/6339)</code>)</li>
<li>Replace use of <code>PyRun_SimpleString</code> with <code>PyRun_SimpleStringFlags</code>.
(:issue:<code>[#6332](https://github.com/pyinstaller/pyinstaller/issues/6332)</code>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>

<ul>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/41842f5ad31dd33d7ba4ae03daace2287c80dcb7"><code>41842f5</code></a> release v4.7</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/b4cd8e7e11fdd614e4cf7cc510b40c950adca023"><code>b4cd8e7</code></a> Update README version for release</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/5c72041b47fcf12915b1228f8bf9255a4b5e168d"><code>5c72041</code></a> rebuild man pages</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/ec02dad83177461a26e5a35fb0050750c192bc5d"><code>ec02dad</code></a> Prepare for release 4.7</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/b9ea730974b4f1b93aeab5fd18b08f647c25f747"><code>b9ea730</code></a> Rebuild bootloaders</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/6248924faae4b50c0bac6e3b80767c7e05271c79"><code>6248924</code></a> Assorted environment checks. (<a href="https://github-redirect.dependabot.com/pyinstaller/pyinstaller/issues/6361">#6361</a>)</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/a10ff6ffa26df1662f8baf8a1eb46d15518ce506"><code>a10ff6f</code></a> bootloader: remove the check for unused windres utility</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/1ca7f65499ff2f8e1990e2fdf1f7ac046804dce4"><code>1ca7f65</code></a> bootloader: set NTDDI_VERSION &amp; _WIN32_WINNT when compiling for Windows</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/4d1c98cd6070c521b2b85ab7e6390dae616f9b60"><code>4d1c98c</code></a> bootloader: replace PyRun_SimpleString with PyRun_SimpleStringFlags</li>
<li><a href="https://github.com/pyinstaller/pyinstaller/commit/d8c434a9100f00ac5ac6a773afa8cdce6f78cbb5"><code>d8c434a</code></a> Bindepend: Fix FileNotFoundErrors in _which_library().</li>
<li>Additional commits viewable in <a href="https://github.com/pyinstaller/pyinstaller/compare/v4.6...v4.7">compare view</a></li>
</ul>
</details>

<br />


[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=pyinstaller&package-manager=pip&previous-version=4.6&new-version=4.7)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---


Dependabot commands and options



You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
unthreaded / git-hooks

Bump pyinstaller from 4.6 to 4.7 #119

Release v4.7

4.7 (2021-11-10)
