Chore: Pin all github external actions versions

[academo]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[github-actions]

Hello! 👋 This repository uses Auto for releasing packages using PR labels.

✨ This PR can be merged. It will not be considered when calculating future versions of the npm packages and will not appear in the changelogs.

[xnyo]

LGTM!

[github-actions]

Playwright test results

Image Name	Version	Result	Report
grafana-dev	12.0.0-236245	✅
grafana-enterprise	11.6.0	✅
grafana-enterprise	11.3.5	✅
grafana-enterprise	10.2.9	✅
grafana-enterprise	9.2.20	✅
grafana-enterprise	8.5.27	✅

Troubleshooting

404 when clicking on View report

By default, the deploy-report-pages Action deploys reports to the gh-pages branch. However, you need to take an extra step to ensure that GitHub Pages can build and serve the site from this branch. To do so:

1. Go to the Settings tab of your repository.
2. In the left-hand sidebar, click on Pages.
3. Under Source, select Deploy from a branch, then choose the gh-pages branch.

This action needs to be completed manually in order for your GitHub Pages site to be built and accessible from the gh-pages branch. Once configured, GitHub will automatically build and serve the site whenever new reports are deployed.