Simplify composer update action to use gh client rather than git

.github/workflows/composer-update.yml

@@ -32,28 +32,17 @@ jobs:
       run: composer install
     - name: Prepare branches
       run: |
-          cat <<- EOF > $HOME/.netrc
-            machine github.com
-            login $GITHUB_ACTOR
-            password $GITHUB_TOKEN
-            machine api.github.com
-            login $GITHUB_ACTOR
-            password $GITHUB_TOKEN
-          EOF
-          chmod 600 $HOME/.netrc
-
-          git config --global user.email "[email protected]"
-          git config --global user.name "$GITHUB_ACTOR"
-          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
-
-          git remote add upstream https://github.com/${GITHUB_REPOSITORY}.git
-
-          git push origin --delete composer-update || true
-          git branch -D composer-update || true
-          git fetch upstream 5.x-dev
-          git checkout -f upstream/5.x-dev
-          git branch composer-update
-          git checkout -f composer-update
+        gh auth setup-git
+        git config --global user.email "[email protected]"
+        git config --global user.name "$GITHUB_ACTOR"
+        gh repo sync
+        git push origin --delete composer-update || true
+        git branch -D composer-update || true
+        git checkout -f 5.x-dev
+        git branch composer-update
+        git checkout -f composer-update
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     - name: Update composer dependencies
       id: update
       run: |
@@ -75,23 +64,14 @@ jobs:
       shell: bash
     - name: Push changes
       run: |
-          git commit -m "Update composer dependencies"
-          git push --set-upstream origin composer-update
+        gh auth setup-git       
+        git commit -m "Update composer dependencies"
+        git push --set-upstream origin composer-update
       shell: bash
       if: steps.update.outputs.message
     - name: Create PR
       run: |
-          message=
-          curl \
-                 --request POST \
-                 --header 'authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' \
-                 --header 'content-type: application/json' \
-                 --data '{
-                  "title":"[automatic composer updates]",
-                  "body":${{ steps.update.outputs.message }},
-                  "head":"composer-update",
-                  "base":"5.x-dev"
-                  }' \
-                 --url https://api.github.com/repos/${GITHUB_REPOSITORY}/pulls
-      shell: bash
+        gh pr create -B 5.x-dev -H composer-update --title '[automatic composer updates]' --body '${{ steps.update.outputs.message }},'
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       if: steps.update.outputs.message