Update dependency urllib3 to v1.26.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
urllib3 (source)	==1.25.11 -> ==1.26.3

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Release Notes

urllib3/urllib3

### [`v1.26.3`](https://togithub.com/urllib3/urllib3/blob/master/CHANGES.rst#​1263-2021-01-26) [Compare Source](https://togithub.com/urllib3/urllib3/compare/1.26.2...1.26.3) - Fixed bytes and string comparison issue with headers (Pull [#​2141](https://togithub.com/urllib3/urllib3/issues/2141)) - Changed `ProxySchemeUnknown` error message to be more actionable if the user supplies a proxy URL without a scheme. (Pull [#​2107](https://togithub.com/urllib3/urllib3/issues/2107)) ### [`v1.26.2`](https://togithub.com/urllib3/urllib3/blob/master/CHANGES.rst#​1262-2020-11-12) [Compare Source](https://togithub.com/urllib3/urllib3/compare/1.26.1...1.26.2) - Fixed an issue where `wrap_socket` and `CERT_REQUIRED` wouldn't be imported properly on Python 2.7.8 and earlier (Pull [#​2052](https://togithub.com/urllib3/urllib3/issues/2052)) ### [`v1.26.1`](https://togithub.com/urllib3/urllib3/blob/master/CHANGES.rst#​1261-2020-11-11) [Compare Source](https://togithub.com/urllib3/urllib3/compare/1.26.0...1.26.1) - Fixed an issue where two `User-Agent` headers would be sent if a `User-Agent` header key is passed as `bytes` (Pull [#​2047](https://togithub.com/urllib3/urllib3/issues/2047)) ### [`v1.26.0`](https://togithub.com/urllib3/urllib3/blob/master/CHANGES.rst#​1260-2020-11-10) [Compare Source](https://togithub.com/urllib3/urllib3/compare/1.25.11...1.26.0) - **NOTE: urllib3 v2.0 will drop support for Python 2**. `Read more in the v2.0 Roadmap `\_. - Added support for HTTPS proxies contacting HTTPS servers (Pull [#​1923](https://togithub.com/urllib3/urllib3/issues/1923), Pull [#​1806](https://togithub.com/urllib3/urllib3/issues/1806)) - Deprecated negotiating TLSv1 and TLSv1.1 by default. Users that still wish to use TLS earlier than 1.2 without a deprecation warning should opt-in explicitly by setting `ssl_version=ssl.PROTOCOL_TLSv1_1` (Pull [#​2002](https://togithub.com/urllib3/urllib3/issues/2002)) **Starting in urllib3 v2.0: Connections that receive a `DeprecationWarning` will fail** - Deprecated `Retry` options `Retry.DEFAULT_METHOD_WHITELIST`, `Retry.DEFAULT_REDIRECT_HEADERS_BLACKLIST` and `Retry(method_whitelist=...)` in favor of `Retry.DEFAULT_ALLOWED_METHODS`, `Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT`, and `Retry(allowed_methods=...)` (Pull [#​2000](https://togithub.com/urllib3/urllib3/issues/2000)) **Starting in urllib3 v2.0: Deprecated options will be removed** - Added default `User-Agent` header to every request (Pull [#​1750](https://togithub.com/urllib3/urllib3/issues/1750)) - Added `urllib3.util.SKIP_HEADER` for skipping `User-Agent`, `Accept-Encoding`, and `Host` headers from being automatically emitted with requests (Pull [#​2018](https://togithub.com/urllib3/urllib3/issues/2018)) - Collapse `transfer-encoding: chunked` request data and framing into the same `socket.send()` call (Pull [#​1906](https://togithub.com/urllib3/urllib3/issues/1906)) - Send `http/1.1` ALPN identifier with every TLS handshake by default (Pull [#​1894](https://togithub.com/urllib3/urllib3/issues/1894)) - Properly terminate SecureTransport connections when CA verification fails (Pull [#​1977](https://togithub.com/urllib3/urllib3/issues/1977)) - Don't emit an `SNIMissingWarning` when passing `server_hostname=None` to SecureTransport (Pull [#​1903](https://togithub.com/urllib3/urllib3/issues/1903)) - Disabled requesting TLSv1.2 session tickets as they weren't being used by urllib3 (Pull [#​1970](https://togithub.com/urllib3/urllib3/issues/1970)) - Suppress `BrokenPipeError` when writing request body after the server has closed the socket (Pull [#​1524](https://togithub.com/urllib3/urllib3/issues/1524)) - Wrap `ssl.SSLError` that can be raised from reading a socket (e.g. "bad MAC") into an `urllib3.exceptions.SSLError` (Pull [#​1939](https://togithub.com/urllib3/urllib3/issues/1939))

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[codecov[bot]]

Codecov Report

Merging #64 (76db118) into master (634a0c8) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #64   +/-   ##
=======================================
  Coverage   76.57%   76.57%           
=======================================
  Files          43       43           
  Lines        2083     2083           
=======================================
  Hits         1595     1595           
  Misses        488      488           

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[agxs]

Not merging due to comment on dependency.

[renovate[bot]]

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