take out 3.7 from black checks (it's deprecated)

.github/workflows/pythonpackage.yml

@@ -22,13 +22,16 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Update pip
+        run: |
+          python -m pip install --upgrade pip
       - name: Code Quality
+        if: matrix.python-version != '3.7'
         run: |
           pip install black
           black pulp/ --check
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
           pip install .
       - name: install glpk
         if: matrix.os == 'ubuntu-latest'