Apply suggestion from @Gui-FernandesBR

Co-authored-by: Gui-FernandesBR <[email protected]>

Author: MateusStano

.github/workflows/test-pytest-slow.yaml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.10, 3.14]
+        python-version: ["3.10", "3.14"]
     env:
       PYTHON: ${{ matrix.python-version }}
       MPLBACKEND: Agg