[release-26.3] Bump toolkit go module to 1.19.1 rc

[github-actions]

🤖 Automated backport of #2461 to release-26.3

Original PR: #2461
Original Author: @cdesiniotis

Cherry-picked commits (1):

• e588bdf Bump toolkit go module to 1.19.1 rc

Next Steps:

1. Review the conflicts in the "Files changed" tab
2. Check out this branch locally: git fetch origin backport-2461-to-release-26.3 && git checkout backport-2461-to-release-26.3
3. Resolve conflicts manually
4. Push the resolution: git push --force-with-lease origin backport-2461-to-release-26.3

---

Instructions for resolving conflicts

git fetch origin backport-2461-to-release-26.3
git checkout backport-2461-to-release-26.3
# Resolve conflicts in your editor
git add .
git commit
git push --force-with-lease origin backport-2461-to-release-26.3

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[cdesiniotis]

I have resolved the merge conflicts.

[cdesiniotis]

/ok to test 8ee4d2f

[coveralls]

coverage: 28.023%. remained the same — backport-2461-to-release-26.3 into release-26.3