Fix RC workflow checkout for branch dispatch

Author: rujche

.github/workflows/test-spring-boot-rc-version.yml

@@ -14,7 +14,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          ref: main
           fetch-depth: 0
       - name: Generate Version File
         run: |
@@ -45,7 +44,8 @@ jobs:
         run: |
           echo "Updating Spring Boot Dependencies Version: ${{ env.spring_boot_version }}"
           echo "Updating Spring Cloud Dependencies Version: ${{ env.spring_cloud_version }}"
-          git checkout -b "${{ env.update_branch }}"
+          git fetch origin main
+          git checkout -B "${{ env.update_branch }}" origin/main
           pip install termcolor
           python ./sdk/spring/scripts/get_spring_boot_managed_external_dependencies.py -b "${{ env.spring_boot_version }}" -c "${{ env.spring_cloud_version }}"
       - name: Update external_dependencies.txt