Update MainDistributionPipeline.yml: branches, no tags

Author: carlopi

.github/workflows/MainDistributionPipeline.yml

@@ -41,4 +41,4 @@ jobs:
       duckdb_version: v1.3.1
       ci_tools_version: main
       extension_name: spatial
-      deploy_latest: ${{ startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main' }}
+      deploy_latest: ${{ startsWith(github.ref, 'refs/heads/v') || github.ref == 'refs/heads/main' }}