chore(ci): upgrade GHA runner image to Ubuntu 26.04 (#42191)

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Co-authored-by: Rehan Islam <2025eb01502@online.bits-pilani.ac.in>
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.github/workflows/github-action-validator.yml

@@ -19,7 +19,7 @@ concurrency:
 
 jobs:
   validate-all-ghas:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     permissions:
       contents: read
       # Required for the zizmor action to upload its SARIF results to