Fix: Missing poetry in "Type-check python" GHA job (#519)

* Install poetry in mypy job

* Use poetry to run mypy

.github/workflows/qa.yml

@@ -301,6 +301,8 @@ jobs:
           ref: ${{ inputs.ref }}
           show-progress: 'false'
           persist-credentials: 'false'
+      - name: Install poetry
+        run: pipx install poetry
       - uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version-file: 'python/pyproject.toml'
@@ -316,8 +318,9 @@ jobs:
         if: steps.changed-py-files.outputs.any_changed == 'true'
         env:
           CHANGED_PY_FILES: ${{ steps.changed-py-files.outputs.all_changed_files }}
-        run: mypy $CHANGED_PY_FILES --ignore-missing-imports
-
+        run: |
+          poetry install --no-interaction --no-ansi
+          poetry run mypy $CHANGED_PY_FILES --ignore-missing-imports
 
   tflint:
     name: Lint terraform