refactor: Updated 'upgrade requirements' workflow to use reusable workflows

[edx-requirements-bot]

Additional information from script execution

Python code cleanup by the cleanup-python-code Jenkins job.

This pull request was generated by the cleanup-python-code Jenkins job, which ran

``` cd .github/workflows; TEAM_REVIEWERS=$(grep 'team-reviewers=' upgrade-python-requirements.yml -m 1 | awk '{print $2}'); TEAM_REVIEWERS=${TEAM_REVIEWERS/--team-reviewers=/}; SCHEDULE=$(grep 'cron:' upgrade-python-requirements.yml -m 1 | sed 's/^.*: //'); EMAIL_TO=$(grep 'to:' upgrade-python-requirements.yml -m 1 | sed 's/^.*: //'); [ -z $(grep 'Send success notification' upgrade-python-requirements.yml) ] && SEND_SUCCESS_NOTIFICATION=$(echo false) || SEND_SUCCESS_NOTIFICATION=$(echo true); : > upgrade-python-requirements.yml; printf "name: Upgrade Requirements\n\non:\n schedule:\n - cron: ${SCHEDULE}\n workflow_dispatch:\n inputs:\n branch:\n description: 'Target branch to create requirements PR against'\n required: true\n default: 'master'\njobs:\n call-upgrade-python-requirements-workflow:\n with:\n branch: \${{ github.event.inputs.branch }}\n team_reviewers: ${TEAM_REVIEWERS}\n email_address: ${EMAIL_TO}\n send_success_notification: ${SEND_SUCCESS_NOTIFICATION}\n secrets:\n requirements_bot_github_token: \${{ secrets.REQUIREMENTS_BOT_GITHUB_TOKEN }}\n requirements_bot_github_email: \${{ secrets.REQUIREMENTS_BOT_GITHUB_EMAIL }}\n edx_smtp_username: \${{ secrets.EDX_SMTP_USERNAME }}\n edx_smtp_password: \${{ secrets.EDX_SMTP_PASSWORD }}\n uses: edx/.github/.github/workflows/upgrade-python-requirements.yml@master\n" >> upgrade-python-requirements.yml; ```

The following packages were installed: ``