feat: add COPILOT_CLI_VERSION to dependency version updater workflow (#137)

Expand the update-awf-version workflow to also check for new
releases of github/copilot-cli and open PRs to update the
COPILOT_CLI_VERSION constant. Bumps max PRs from 1 to 2 to
allow both dependencies to be updated in a single run.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jamesadevine