Update actions/github-script action to v8

| datasource  | package               | from | to |
| ----------- | --------------------- | ---- | -- |
| github-tags | actions/github-script | v7   | v8 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/docs-build.yml

@@ -39,14 +39,14 @@ jobs:
 
       - name: Normalize current versions
         id: current
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: return context.ref.match(/([0-9]+\.[0-9]+)\.(x|[0-9]+)/i)[1];
           result-encoding: string
 
       - name: Normalize latest versions
         id: latest
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: return "${{steps.latest_release.outputs.release}}".match(/([0-9]+\.[0-9]+)\.[0-9]+/i)[1];
           result-encoding: string