build(deps): bump GuillaumeFalourd/branch-exists from 1.1 to 1.2

Bumps [GuillaumeFalourd/branch-exists](https://github.com/guillaumefalourd/branch-exists) from 1.1 to 1.2.
- [Release notes](https://github.com/guillaumefalourd/branch-exists/releases)
- [Commits](GuillaumeFalourd/branch-exists@v1.1...v1.2)

---
updated-dependencies:
- dependency-name: GuillaumeFalourd/branch-exists
  dependency-version: '1.2'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/raise-rc-merge-pr.yml

@@ -58,7 +58,7 @@ jobs:
           github_sha_hash=${{ github.sha }}  
           echo "MERGE_BRANCH_NAME=merge-${{ github.ref_name }}-${{ matrix.target-branch }}-${github_sha_hash:0:7}" >> $GITHUB_ENV
       - id: check-branch-exists
-        uses: GuillaumeFalourd/branch-exists@v1.1
+        uses: GuillaumeFalourd/branch-exists@v1.2
         with:
           branch: ${{ env.MERGE_BRANCH_NAME }}
       - name: Create Merge Branch