Remove redundant installation step

Author: Ickerday

.github/workflows/test.yml

@@ -23,11 +23,7 @@ jobs:
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405
         with:
           python-version: ${{ matrix.python-version }}
-      - name: (Python 3.7) Install dependencies
-        if: ${{ matrix.python-version == '3.7' }}
-        run: python -m pip install deprecation python-dotenv pytest
-      - name: (Python >= 3.9) Install dependencies
-        if: ${{ matrix.python-version != '3.7' }}
+      - name: Install dependencies
         run: python -m pip install . --group test
       - name: Run entire test suite
         run: python -m pytest ./tests