(apro) _go-common.mk: Bump golangci-lint version
(apro) _go-common.mk: Bump golangci-lint version

Notably, this pulls in a newer `goimports`, which is less strict about
having to name your imports.

v2:
 - Bump again: 1.13.1→1.14.0→1.15.0
 - Add a "// #nosec G107" comment to stop the `gosec` linter from calling
   out our use of OIDC Discovery.

datawire/ambassador,datawire/ambassador,datawire/ambassador,datawire/ambassador,datawire/ambassador