chore(deps): update ghcr.io/pingcap-qe/cd/builders/ng-monitoring docker tag to v2025.11.9-1-ga8991fa-centos7-go1.23

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This PR contains the following updates:

Package	Update	Change
ghcr.io/pingcap-qe/cd/builders/ng-monitoring	minor	v2025.10.19-13-geb9ab3d-centos7-go1.23 -> v2025.11.9-1-ga8991fa-centos7-go1.23

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