v2.0.x Chore - Consider adding caching for Python dependencies.

[reactive-firewall]

Consider adding caching for Python dependencies.

The BUILD job could benefit from caching pip dependencies to improve workflow execution time.

Add caching after the Python setup:

      - uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
        with:
          python-version: "3.12"
      - uses: actions/cache@v3
        with:
          path: ~/.cache/pip
          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
          restore-keys: |
            ${{ runner.os }}-pip-