workflows: analysis: default checkout

Should work in checkout@v3

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

.github/workflows/analysis.yml

@@ -28,8 +28,6 @@ jobs:
                     echo "PR: ${{ steps.get-vars.outputs.pr }}"
                     echo "RUN NUMBER: $GITHUB_RUN_NUMBER"
             -   uses: actions/checkout@v3
-                with:
-                    ref: ${{ steps.get-vars.outputs.branch }}
             -   name: Set up JDK 11
                 uses: actions/setup-java@v2
                 with: