Fix build: Add patch version to go directive in go.mod

[kpaulisse]

This PR removes the CI failures that were occurring due to:

go: updates to go.mod needed; to update it:
        go mod tidy
make: *** [Makefile:13: test.unit] Error 1

Based on the discussion in golang/go#62278 (comment) and the fact that this project doesn't seem to rely on any specific patch revision, I put 1.23.0 to resolve the issue.

[andreykaipov]

Awesome - thank you! Seems like the initial test workflow failed because of some flaky functional test, but now it passed.