build: To push back changelog, we need a separate user.

We can't currently bypass branch protection rules for the default github
app user in github actions. (https://github.com/orgs/community/discussions/13836)

So we need to use the semantic release github user which has been added
to the list of users that can bypass branch protection.

Author: feanil

.github/workflows/release.yml

@@ -40,7 +40,7 @@ jobs:
         # Adjust tag with desired version if applicable.
         uses: python-semantic-release/[email protected]
         with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
+          github_token: ${{ secrets.OPENEDX_SEMANTIC_RELEASE_GITHUB_TOKEN }}
           git_committer_name: "github-actions"
           git_committer_email: "[email protected]"
           directory: './backend'
@@ -49,7 +49,7 @@ jobs:
         uses: python-semantic-release/[email protected]
         if: steps.release.outputs.released == 'true'
         with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
+          github_token: ${{ secrets.OPENEDX_SEMANTIC_RELEASE_GITHUB_TOKEN }}
           tag: ${{ steps.release.outputs.tag }}
           directory: './backend'