fix: reverted ci workflow to working state

.github/workflows/tests.yml

@@ -7,15 +7,15 @@ on:
 
 jobs:
  test:
- runs-on: python:3.9
+ runs-on: ubuntu-latest
  steps:
  - name: Checkout Repository
  uses: actions/checkout@v4
  - name: Cache pip install
  uses: actions/setup-python@v5
  with:
- python-version: '3.9'
- cache: 'pip'
+ python-version: "3.9"
+ cache: "pip"
  - name: Install Dependencies
  run: pip install -r requirements-dev.txt
  - name: Run test