Bump ffi from 1.14.2 to 1.15.0

[dependabot-preview[bot]]

Bumps ffi from 1.14.2 to 1.15.0.

Changelog

Sourced from ffi's changelog.

1.15.0 / 2021-03-05

Fixed:

• Fix MSVC build
• Fix async callbacks in conjunction with fork(). #884

Added:

• Allow to pass callbacks in varargs. #885
• Name the threads for FFI callback dispatcher and async thread calls for easier debugging. #883 The name can be retrieved by Thread.name and is shown by Thread.list.inspect etc. Even gdb shows the thread name on supported operating systems.
• Add types.conf for powerpc64le-linux
• Add types.conf for riscv64-linux
• More release automation of ffi gems

Changed:

• Switch from rubygems-tasks to bundler/gem_helper

Removed:

• Remove unused VariadicInvoker#init

Commits

• 1fb309c Use platform name as used by rubygems
• 05537c7 Merge pull request #888 from larskanis/async-callback-with-fork
• df39cc6 Fix async callbacks in conjunction with fork()
• ea13267 Prepare ffi-1.15.0
• 1a87af0 Replace rubygems-tasks by bundler and do more release automation
• 334c3af Use shorter thread names for FFI's callbacks
• 1cce06d Merge branch 'name-dispatcher-thread' of https://github.com/DataDog/ffi into ...
• c48dfe7 Implement async callback test on Windows and improve async specs
• 6d14c0a Separate double callback spec and variadic call with function pointer
• 57bcc60 Remove unused VariadicInvoker#init
• Additional commits viewable in compare view

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 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) - `@dependabot use these labels` will set the current labels as the default for future PRs for this repo and language - `@dependabot use these reviewers` will set the current reviewers as the default for future PRs for this repo and language - `@dependabot use these assignees` will set the current assignees as the default for future PRs for this repo and language - `@dependabot use this milestone` will set the current milestone as the default for future PRs for this repo and language - `@dependabot badge me` will comment on this PR with code to add a "Dependabot enabled" badge to your readme Additionally, you can set the following in your Dependabot [dashboard](https://app.dependabot.com): - Update frequency (including time of day and day of week) - Pull request limits (per update run and/or open at any time) - Automerge options (never/patch/minor, and dev/runtime dependencies) - Out-of-range updates (receive only lockfile updates, if desired) - Security updates (receive only security updates, if desired)

[dependabot-preview[bot]]

Superseded by #481.