ci: Fix cache

Author: tony

.github/workflows/tests.yml

@@ -51,8 +51,8 @@ jobs:
         with:
           path: |
             .venv
-            {{ env.poetry_cache_dir }}
-            {{ env.poetry_virtualenvs_path }}
+            ${{ env.poetry_cache_dir }}
+            ${{ env.poetry_virtualenvs_path }}
           key: venv-${{ runner.os }}-${{ steps.full-python-version.outputs.version }}-${{ hashFiles('**/poetry.lock') }}
 
       - name: Ensure cache is healthy