Update phpunit/phpunit requirement from ^8.3 to ^8.5

[dependabot-preview[bot]]

Updates the requirements on phpunit/phpunit to permit the latest version.

Changelog

*Sourced from [phpunit/phpunit's changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-8.5.md).* > ## [8.5.0] - 2019-12-06 > > ### Added > > * Implemented [#3911](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3911): Support combined use of `addMethods()` and `onlyMethods()` > * Implemented [#3949](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3949): Introduce specialized assertions `assertFileEqualsCanonicalizing()`, `assertFileEqualsIgnoringCase()`, `assertStringEqualsFileCanonicalizing()`, `assertStringEqualsFileIgnoringCase()`, `assertFileNotEqualsCanonicalizing()`, `assertFileNotEqualsIgnoringCase()`, `assertStringNotEqualsFileCanonicalizing()`, and `assertStringNotEqualsFileIgnoringCase()` as alternative to using `assertFileEquals()` etc. with optional parameters > > ### Changed > > * Implemented [#3860](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/pull/3860): Deprecate invoking PHPUnit commandline test runner with just a class name > * Implemented [#3950](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3950): Deprecate optional parameters of `assertFileEquals()` etc. > * Implemented [#3955](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3955): Deprecate support for doubling multiple interfaces > > ### Fixed > > * Fixed [#3953](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3953): Code Coverage for test executed in isolation does not work when the PHAR is used > * Fixed [#3967](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3967): Cannot double interface that extends interface that extends `\Throwable` > * Fixed [#3968](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/pull/3968): Test class run in a separate PHP process are passing when `exit` called inside > > [8.5.0]: https://github.com/sebastianbergmann/phpunit/compare/8.4.3...8.5.0

Commits

- [`3ee1c1f`](https://github.com/sebastianbergmann/phpunit/commit/3ee1c1fd6fc264480c25b6fb8285edefe1702dab) Fix - [`ae6345e`](https://github.com/sebastianbergmann/phpunit/commit/ae6345e27d4d7a7ba5f4cf8d80516c2f46e41cad) Prepare release - [`a29fcbf`](https://github.com/sebastianbergmann/phpunit/commit/a29fcbf918c8fab80cae6da4edac41565779d265) Fix: Run roave/backward-compatibility-check with ext/intl installed - [`f40603d`](https://github.com/sebastianbergmann/phpunit/commit/f40603d31c990d333c060314031730f1188b34ea) Refactor - [`03dc427`](https://github.com/sebastianbergmann/phpunit/commit/03dc427623fad0d15db80be53664a6a862a3e072) Update ChangeLog - [`e506da1`](https://github.com/sebastianbergmann/phpunit/commit/e506da188c6f021ac5a6adbd6bf88046675114d1) add test for depraction warning - [`d38c327`](https://github.com/sebastianbergmann/phpunit/commit/d38c327998de915dfaf5317a6487ccd53fa3ac50) fixed calling with directory leads to deprecation warning - [`5cf2f25`](https://github.com/sebastianbergmann/phpunit/commit/5cf2f258f49393004561ed93cfba1f9056c09e18) fixed tests to not use deprecated syntax - [`bbc2ea9`](https://github.com/sebastianbergmann/phpunit/commit/bbc2ea926b57651d4c9c6789e1947bf3fa4e6bf9) add deprecation warning when called with just a class name - [`194a983`](https://github.com/sebastianbergmann/phpunit/commit/194a98326f99693a3a8721dffc3b7dc51323cc95) Update ChangeLog - Additional commits viewable in [compare view](https://github.com/sebastianbergmann/phpunit/compare/8.3.0...8.5.0)

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[Gummibeer]

@dependabot ignore this dependency

[dependabot-preview[bot]]

OK, I won't notify you about phpunit/phpunit again, unless you re-open this PR or update it yourself. 😢