middleware: revert the link to jwt issue

With the migration to form3-tech/jwt-go repo, one of the string replaces
also edited a link in the comment to an issue in the old jwt repo. This
commit reverses the edit.

Signed-off-by: Raghavendra Talur <rtalur@redhat.com>
(cherry picked from commit 69b5267)

middleware/jwt.go

@@ -42,7 +42,7 @@ func init() {
 	}
 }
 
-// From https://github.com/form3tech-oss/jwt-go/pull/139 it is understood
+// From https://github.com/dgrijalva/jwt-go/pull/139 it is understood
 // that if the machine where jwt token is generated and/or the machine
 // where jwt token is verified have any clock skew then there is a
 // possibility of getting a "Token used before issued" error.