ci: fixes target branch definition to support multiple releases automatically

Signed-off-by: Vincent Biret <[email protected]>

Author: baywet

.github/workflows/release-please-gha.yml

@@ -35,3 +35,4 @@ jobs:
           token: ${{ steps.app-token.outputs.token }}
           config-file: release-please-config.json
           manifest-file: .release-please-manifest.json
+          target-branch: ${{ github.ref_name }}