ci(release-please): ensure main exists when rebasing (#3104)

Author: pichlermarc

.github/workflows/release-please.yml

@@ -60,7 +60,8 @@ jobs:
         run: |
           git config user.name otelbot
           git config user.email [email protected]
-          git rebase main -x "git commit --amend --reset-author --no-edit"
+          git fetch origin main:refs/remotes/origin/main
+          git rebase origin/main -x "git commit --amend --reset-author --no-edit"
           npm install --ignore-scripts --package-lock-only
           git add package-lock.json
           git commit -m "chore: sync package-lock.json 'dependencies' key"