Update dependency phpunit/phpunit to v8.5.26

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
phpunit/phpunit (source)	require-dev	patch	8.5.15 -> 8.5.26

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Release Notes

sebastianbergmann/phpunit

### [`v8.5.26`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.25...8.5.26) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.25...8.5.26) ### [`v8.5.25`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.24...8.5.25) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.24...8.5.25) ### [`v8.5.24`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.23...8.5.24) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.23...8.5.24) ### [`v8.5.23`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.22...8.5.23) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.22...8.5.23) ### [`v8.5.22`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.21...8.5.22) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.21...8.5.22) ### [`v8.5.21`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.20...8.5.21) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.20...8.5.21) ### [`v8.5.20`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.19...8.5.20) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.19...8.5.20) ### [`v8.5.19`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.18...8.5.19) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.18...8.5.19) ### [`v8.5.18`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.17...8.5.18) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.17...8.5.18) ### [`v8.5.17`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.16...8.5.17) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.16...8.5.17) ### [`v8.5.16`](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.15...8.5.16) [Compare Source](https://togithub.com/sebastianbergmann/phpunit/compare/8.5.15...8.5.16)

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