Merge branch 'master' into bagatur/locals_in_config

.github/workflows/_test.yml

@@ -46,7 +46,11 @@ jobs:
               elif [ "${{ matrix.test_type }}" == "core-pydantic-2" ]; then
                 echo "Running core-pydantic-v2 tests, installing dependencies with poetry..."
                 poetry install
-                poetry add pydantic@2.1
+
+                # Install via `pip` instead of `poetry add` to avoid changing lockfile,
+                # which would prevent caching from working: the cache would get saved
+                # to a different key than where it gets loaded from.
+                poetry run pip install 'pydantic>=2.1,<3'
               else
                 echo "Running extended tests, installing dependencies with poetry..."
                 poetry install -E extended_testing