[llvm] [CI] Make email check workflow fail when author's email is private in Github UI (PR #148694)

[Udit Kumar Agarwal via llvm-commits]

================
@@ -20,14 +20,30 @@ jobs:
 
       - name: Extract author email
         id: author
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
----------------
uditagarwal97 wrote:

```suggestion
          GITHUB_TOKEN: ${{ github.token }}
```

https://github.com/llvm/llvm-project/pull/148694