Pin MotherDuck-compatible DuckDB adapter

Author: Aaron Neiderhiser

.github/workflows/dbt_v1.10.15_duckdb_build_full_refresh.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Install dbt-core and DuckDB adapter
         run: |
           python -m pip install --upgrade pip
-          pip install dbt-core==${{ env.DBT_CORE_VERSION}} dbt-duckdb
+          pip install dbt-core==${{ env.DBT_CORE_VERSION}} "dbt-duckdb[md]"
 
       - name: Install dbt dependencies
         run: dbt deps --profiles-dir ./integration_tests/profiles/duckdb
@@ -45,4 +45,4 @@ jobs:
       - name: Build dbt models (full-refresh)
         run: |
           dbt build --full-refresh --profiles-dir ./integration_tests/profiles/duckdb
-        working-directory: ${{ env.DBT_PROJECT_DIR }}
+        working-directory: ${{ env.DBT_PROJECT_DIR }}