mod : Replace for OSV GO-2020-0017 JWT

The github.com/dgrijalva/jwt-go is no longer maintained
has this CVE https://github.com/advisories/GHSA-w73w-5m7g-f7qc

But it is being used by https://github.com/etcd-io/etcd/issues/13254
which `lnd` uses.

The https://github.com/golang-jwt/jwt/releases/tag/v3.2.1 is a fork of
the same version which was 3.2.0 with the security fix.

go.mod

@@ -81,6 +81,9 @@ replace github.com/lightningnetwork/lnd/kvdb => ./kvdb
 
 replace git.schwanenlied.me/yawning/bsaes.git => github.com/Yawning/bsaes v0.0.0-20180720073208-c0276d75487e
 
+// This replace is for https://github.com/advisories/GHSA-w73w-5m7g-f7qc
+replace github.com/dgrijalva/jwt-go => github.com/golang-jwt/jwt v3.2.1+incompatible
+
 // If you change this please also update .github/pull_request_template.md and
 // docs/INSTALL.md.
 go 1.15