release: ensure dependencies are updated in release branches

[anmazzotti]

This issue is about implementing dependencies bump automation for release branches.

Acceptance Criteria:

• Automation should only target branches for releases that are maintained and supported.
• Automation should only bump patch releases, no minor/major bumps.
• Changes should be tested by all available e2e coverage (ex. run e2e tests on release branches)
• Bumps should include:
  • go version
  • go.mod dependencies
  • CAPI providers (including Core)
  • rancher/kuberlr-kubectl image