chore(deps) Bump github.com/go-git/go-billy/v5 to v5.9.0 to avoid CVE…

[nmirasch]

…-2026-44740
https://www.cve.org/CVERecord?id=CVE-2026-44740
GHSA-m3xc-h892-ggx6

Fixes: https://redhat.atlassian.net/browse/GITOPS-10734

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/kind bug
/kind cleanup
/kind failing-test
/kind enhancement
/kind documentation
/kind code-refactoring

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• Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?

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[openshift-ci]

Hi @nmirasch. Thanks for your PR.

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[nmirasch]

/ok-to-test

[nmirasch]

/retest