Bump phpunit/phpunit from 7.5.8 to 7.5.9

[dependabot-preview[bot]]

Bumps phpunit/phpunit from 7.5.8 to 7.5.9.

Changelog

*Sourced from [phpunit/phpunit's changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-7.5.md).* > ## [7.5.9] - 2019-04-19 > > ### Fixed > > * Fixed [#3607](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3607): Return value generation interferes with proxying to original method

Commits

- [`134669c`](https://github.com/sebastianbergmann/phpunit/commit/134669cf0eeac3f79bc7f0c793efbc158bffc160) Prepare release - [`c9ea4fe`](https://github.com/sebastianbergmann/phpunit/commit/c9ea4feb9207ddbd529a63f574be2b7b34e51e93) Prefix name of variable that holds invocation object and clean up the variabl... - [`fdc4cbc`](https://github.com/sebastianbergmann/phpunit/commit/fdc4cbc20573641533741a41a85a77c7285013ae) Closes [#3607](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3607) - [`2e71a95`](https://github.com/sebastianbergmann/phpunit/commit/2e71a959277515b90f4f078c1b66b31a510e47a2) Add (failing) test for [#3607](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3607) - [`898243a`](https://github.com/sebastianbergmann/phpunit/commit/898243a3bdc657f3ba90c394b0ae2f6e6183e328) Improve runtime tests for test proxies - [`c051ac3`](https://github.com/sebastianbergmann/phpunit/commit/c051ac37fca9886686a1f37ce6b8806c1c5cb85c) Update tools - [`d62b3ca`](https://github.com/sebastianbergmann/phpunit/commit/d62b3caa3aea4ccca694e870bff7070d371d0e9a) Improve runtime tests for test proxies - [`6e388aa`](https://github.com/sebastianbergmann/phpunit/commit/6e388aa37e12564546a80c2ba3a431b704c4acb1) Update tools - See full diff in [compare view](https://github.com/sebastianbergmann/phpunit/compare/7.5.8...7.5.9)

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Superseded by #27.