fix(ci): bust stale cache key so dev group installs correctly

Author: FirstUnicorn

.github/workflows/linters.yml

@@ -33,7 +33,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: .venv
-          key: venv-lint-${{ runner.os }}-${{ hashFiles('**/poetry.lock') }}
+          key: venv-lint-devtest-${{ runner.os }}-${{ hashFiles('**/poetry.lock') }}
 
       - name: Install dependencies
         run: poetry install --with dev,test --no-interaction