Add go 1.19, require go 1.18, drop go 1.17

[kolyshkin]

This makes go 1.18 a minimally required version, removing go 1.17 from and adding go 1.19 to CI.

Also:

• [x] remove old-style +build tags
• [x] fix the docstrings to be compatible with go 1.19 (see https://tip.golang.org/doc/comment)
• [x] wait for golangci-lint release that fixes https://github.com/golangci/golangci-lint/issues/2922
• [x] remove test (1.17.x) from the required set of tests
• [ ] add test (1.19.x) to required list of tests (once this is merged)

[kolyshkin]

OK, it seems to be working fine, except for golangci-lint (filed https://github.com/golangci/golangci-lint/issues/2922)

[AkihiroSuda]

1.19 is GA now

[kolyshkin]

Alas we have to wait for a new golangci-lint release that has https://github.com/golangci/golangci-lint/issues/2922 fixed. The fix is already merged but no release has been made yet (I guess it will be v1.48).

[kolyshkin]

Since I've already marked 1.19.x CI tests as required, can we please merge this? @opencontainers/runc-maintainers PTAL

[kolyshkin]

@AkihiroSuda PTAL 🙏🏻

[thaJeztah]

@kolyshkin are you updating the repo settings? ("add test (1.19.x) to required list of tests (once this is merged)")