Release gotp v0.6.1 (2025-02-03)

This releases mostly contains chores that update the dependencies and
tooling.

[CHORE]
We have replace all linters from third party and external program to use
internal command and "go vet" only.
This should simplify setting up development.

[CHORE]
The CHANGELOG has been moved to the root of repository.
This is to allow people to see the CHANGELOG directly without going to
subdirectory first.

[CHORE]
The "gotp version" now set from output of "git describe" and set using
"-ldflags" during build option.
The output also changes from "go v<SEMVER>" to "go version <SEMVER>".
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