Bump phpunit/phpunit from 9.6.3 to 9.6.4

Bumps phpunit/phpunit from 9.6.3 to 9.6.4.

Changelog

Sourced from phpunit/phpunit's changelog.

[9.6.4] - 2023-02-27

Fixed

• #5186: SBOM does not validate

Commits

• 9125ee0 Prepare release
• e0d2712 Merge branch '8.5' into 9.6
• 7d1ff0e Prepare release
• e733b04 Update ChangeLog
• 9b20b5c Merge branch '8.5' into 9.6
• cb67d43 Closes #5186
• f691be2 Merge branch '8.5' into 9.6
• 77dd3b6 Update tools
• c5e3ee5 Merge branch '8.5' into 9.6
• 22daac5 Update tools
• Additional commits viewable in compare view

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