use stable duckdb version in CI

Author: c-herrewijn

.github/workflows/MainDistributionPipeline.yml

@@ -16,7 +16,7 @@ jobs:
     name: Build extension binaries
     uses: duckdb/extension-ci-tools/.github/workflows/[email protected]
     with:
-      duckdb_version: main
+      duckdb_version: v1.3.1
       extension_name: sqlite_scanner
       ci_tools_version: v1.3.1
 
@@ -26,7 +26,7 @@ jobs:
     uses: duckdb/extension-ci-tools/.github/workflows/[email protected]
     secrets: inherit
     with:
-      duckdb_version: main
+      duckdb_version: v1.3.1
       extension_name: sqlite_scanner
       ci_tools_version: v1.3.1
       deploy_latest: ${{ startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main' }}