fix(prometheus): drop sslcacert from grafana repo config - #6

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683, anchore/scan-action@v6, ASzc/change-string-case-action@d0603cd0a7dd490be678164909f65c7737470a7f, docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804, github/codeql-action/upload-sarif@v3, redhat-actions/buildah-build@7a95fa7ee0f02d552a32753e7414641a04307056. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

CodeQL Action v3 will be deprecated in December 2026. Please update all occurrences of the CodeQL Action in your workflow files to v4. For more information, see https://github.blog/changelog/2025-10-28-upcoming-deprecation-of-codeql-action-v3/