ci(deps): bump actions/github-script from 6 to 8

Bumps [actions/github-script](https://github.com/actions/github-script) from 6 to 8.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@v6...v8)

---
updated-dependencies:
- dependency-name: actions/github-script
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/benchmark.yml

@@ -134,7 +134,7 @@ jobs:
         echo '```' >> benchmark_comparison.md
 
     - name: Comment benchmark results
-      uses: actions/github-script@v6
+      uses: actions/github-script@v8
       with:
         script: |
           const fs = require('fs');

.github/workflows/performance-validation.yml

@@ -305,7 +305,7 @@ jobs:
 
     - name: Comment PR with performance results
       if: github.event_name == 'pull_request'
-      uses: actions/github-script@v7
+      uses: actions/github-script@v8
       with:
         script: |
           const fs = require('fs');

.github/workflows/rollback.yml

@@ -405,7 +405,7 @@ jobs:
           cat rollback-report.md
 
       - name: Create GitHub Issue
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: |
             const fs = require('fs');