chore: add /v2 to import module path (#9072)

* chore: add /v2 to import module path

go mod requires semantic versioning with versions greater than 1.x

This was a mechanical update by running:
```
go install github.com/marwan-at-work/mod/cmd/mod@latest
mod upgrade
```

Migrate generated files to import /v2

* Fix gen

coderd/oauthpki/oidcpki.go

@@ -21,7 +21,7 @@ import (
 	"golang.org/x/oauth2/jws"
 	"golang.org/x/xerrors"
 
-	"github.com/coder/coder/coderd/httpmw"
+	"github.com/coder/coder/v2/coderd/httpmw"
 )
 
 // Config uses jwt assertions over client_secret for oauth2 authentication of

coderd/oauthpki/okidcpki_test.go

@@ -18,8 +18,8 @@ import (
 	"golang.org/x/oauth2"
 	"golang.org/x/xerrors"
 
-	"github.com/coder/coder/coderd/oauthpki"
-	"github.com/coder/coder/testutil"
+	"github.com/coder/coder/v2/coderd/oauthpki"
+	"github.com/coder/coder/v2/testutil"
 )
 
 const (