Add write permissions and remove branch creation

Author: sarahchen6

.github/workflows/update-jmxfetch-submodule.yaml

@@ -8,6 +8,8 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - name: Checkout repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
@@ -22,10 +24,6 @@ jobs:
       - name: Pick a branch name
         id: define-branch
         run: echo "branch=ci/update-jmxfetch-submodule-$(date +'%Y%m%d')" >> $GITHUB_OUTPUT
-      - name: Create branch
-        run: |
-          git checkout -b ${{ steps.define-branch.outputs.branch }}
-          git push -u origin ${{ steps.define-branch.outputs.branch }} --force
       - name: Commit and push changes
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}