Bump phpunit/phpunit from 9.6.11 to 9.6.12

[dependabot[bot]]

Bumps phpunit/phpunit from 9.6.11 to 9.6.12.

Changelog

Sourced from phpunit/phpunit's changelog.

[9.6.12] - 2023-09-12

Changed

• #5508: Generate code coverage report in PHP format as first in list to avoid serializing cache data

Commits

• a122c2e Prepare release
• 0f2594d Update ChangeLog
• a3ad9d1 CodeCoverage: process PHP report as first in list to avoid serializing cache ...
• 63d1346 Merge branch '8.5' into 9.6
• 187a9c4 Update tools
• bf8634b GH Actions: actually run the tests on Windows
• e4c3197 E2E/diff-colorized: add separate test for Windows
• f50f5b4 E2E/DiffTest: fix line endings
• c472292 E2E Tests: use OS agnostic directory separators
• 2552659 Merge branch '8.5' into 9.6
• Additional commits viewable in compare view

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