ci: Fix committing back updated SHA

.github/workflows/update-formula.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
       - uses: actions/[email protected]
         with:
-          ref: ${{ github.head.ref }}
+          ref: ${{ github.head_ref }}
           token: ${{ secrets.PAT }}
       - name: Download Knope Source
         run: curl -o source.tgz https://codeload.github.com/knope-dev/knope/tar.gz/refs/tags/v0.13.0
@@ -24,8 +24,6 @@ jobs:
       - name: Commit back new SHA if it changed
         if: steps.check-sha.outputs.changed == 'yes'
         run: |
-          git config --global user.name "github-actions[bot]"
-          git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
           git add Formula/knope.rb
           git commit -m "Update SHA to ${{ env.NEW_SHA }}"
           git push