Fix action file path (#59)

The path `poetry.lock` is wrong, fixed

.github/actions/setup-poetry-env/action.yml

@@ -25,7 +25,7 @@ runs:
       uses: actions/cache@v4
       with:
         path: .venv
-        key: venv-${{ runner.os }}-${{ inputs.python-version }}-${{ hashFiles('poetry.lock') }}
+        key: venv-${{ runner.os }}-${{ inputs.python-version }}-${{ hashFiles('arcade/poetry.lock') }}
 
     - name: Install dependencies
       if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'