workflows: Fix missing GITHUB_TOKEN in release-doxygen.yml upload step (#91091)

We were accidentally setting the GITHUB_TOKEN environment variable in
the previous step.

Author: tstellar

.github/workflows/release-doxygen.yml

@@ -56,12 +56,12 @@ jobs:
           pip3 install --user -r ./llvm/docs/requirements.txt
 
       - name: Build Doxygen
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
         run: |
           ./llvm/utils/release/build-docs.sh -release "${{ inputs.release-version }}" -no-sphinx
 
       - name: Upload Doxygen
         if: env.upload
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
         run: |
           ./llvm/utils/release/github-upload-release.py --token "$GITHUB_TOKEN" --release "${{ inputs.release-version }}" --user "${{ github.actor }}" upload --files ./*doxygen*.tar.xz