Bump repository to Go 1.19

[timflannagan]

Signed-off-by: timflannagan [email protected]

Description of the change:
Update the repository from Go 1.18 to 1.19. Update the GHAs to determine the desired Go version by reading from the root go.mod file, which is consistent with the approach taken for the rest of the OLM repositories and should help reduce maintenance burden over time.

Motivation for the change:
Regular maintenace.

Architectural changes:
N/A.

Testing remarks:

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Bug fixes are accompanied by regression test(s)
• e2e tests and flake fixes are accompanied evidence of flake testing, e.g. executing the test 100(0) times
• tech debt/todo is accompanied by issue link(s) in comments in the surrounding code
• Tests are comprehensible, e.g. Ginkgo DSL is being used appropriately
• Docs updated or added to /doc
• Commit messages sensible and descriptive
• Tests marked as [FLAKE] are truly flaky and have an issue
• Code is properly formatted

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[oceanc80]

/lgtm

[timflannagan]

Note: this should help reduce maintenance burden over time. Most of the next gen repositories (e.g. rukpak, deppy, etc.) have been using this approach for a bit.

[awgreene]

/lgtm