go-oidc using wrong import path

github.com/coreos/go-oidc has never used gopkg.in, and we may break this soon when we add a go.mod file (https://github.com/coreos/go-oidc/pull/228).

Just a heads up that you'll need to use the correct import path "github.com/coreos/go-oidc"

https://github.com/cloudflare/cloudflared/blob/7367827a1117932e0fbea37594b136ae4bf0ba33/validation/validation.go#L15

Open validation/validation.go at line 15 and inspect the go-oidc import. Update it to use github.com/coreos/go-oidc, then verify that the project still builds and its checks pass.

Written by the indexing model from the issue text.