fix(ci): pin phpunit to 13.3.x)

[v-scharf]

https://ci.opencloud.rocks/repos/3/pipeline/3657/140

with 13.4.0 our CI is down

Running apiAntivirus tests tagged ~@skip&&~@skipOnOpencloud-posix-Storage&&~@skip
Using behat config 'tests/acceptance/config/behat.yml'

Fatal error: Uncaught ArgumentCountError: Too few arguments to function PHPUnit\TextUI\CliArguments\Builder::__construct(), 0 passed in /woodpecker/src/github.com/opencloud-eu/opencloud/tests/acceptance/bootstrap/bootstrap.php on line 64 and exactly 1 expected in /woodpecker/src/github.com/opencloud-eu/opencloud/vendor-bin/behat/vendor/phpunit/phpunit/src/TextUI/Configuration/Cli/Builder.php:266

that is quick fix, later we need to figure out how to switch to 13.4.0
cc @saw-jan

[codacy-production]

Up to standards ✅

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🟢 Coverage ∅ diff coverage

Metric	Results
Coverage variation	Report missing for 6aa9d311
Diff coverage	✅ ∅ diff coverage

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Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6aa9d31)	Report Missing	Report Missing	Report Missing
Head commit (56e21af)	89080	21612	24.26%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#3644)	0	0	∅ (not applicable)

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