Update the golang tools-version to 1.19.7

What does this MR do?

Updates the golang version used in development to 1.19.7, which is already part of gdk https://gitlab.com/gitlab-org/gitlab-development-kit/-/blob/main/.tool-versions#L6-26

Pages has been testing with 1.19 in CI since !829 (merged)

Part of &9495 (closed)

TODO

• Feature flag
  • Added feature flag:
  • This feature does not require a feature flag
• I added the Changelog trailer to the commits that need to be included in the changelog (e.g. Changelog: added)
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines