[ISSUE-190] Update go version in go.mod to use 1.N.P format

[jameskim0987]

Resolves #190

Changes made in this PR:

1. Update go version in go.mod from 1.21 to 1.21.0
2. Run go mod tidy

[jameskim0987]

Hi @kehoecj, this PR is ready for review.

I have a question regarding the go version -- since the repo has been using 1.21 already, it has been automatically been using the latest patch of 1.21.x. Come to think of it, is it necessary to specify the patch version at this point in time? If so, what would be the target version be?

[kehoecj]

Hi @kehoecj, this PR is ready for review.

I have a question regarding the go version -- since the repo has been using 1.21 already, it has been automatically been using the latest patch of 1.21.x. Come to think of it, is it necessary to specify the patch version at this point in time? If so, what would be the target version be?

I definitely found the documentation a bit confusing as well. This module version just sets a minimal version starting in 1.21 go wants the patch specified as well. So specifying go 1.21.0 just means you need to have at least go 1.21 installed to be able to build. There is some additional consideration if your project is used as a library but the validator is not used in this way. I checked a lot of popular go projects on Github and your solution is consistent with their approach.

[kehoecj]

LGTM - thannks @jameskim0987 !