fix(ci): use inline python-version instead of file ref in migration-test.yml

Signed-off-by: RoddyGitHub <roddy@users.noreply.github.com>

Author: roddy

.github/workflows/migration-test.yml

@@ -48,7 +48,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v5
         with:
-          python-version-file: .python-version
+          python-version: "3.12"
 
       - name: Sync workspace
         run: uv sync --frozen