Fix CVE CVE-2020-29652

Author: asatsi

vendor/modules.txt

@@ -144,7 +144,7 @@ github.com/xdg/scram
 # github.com/xdg/stringprep v1.0.0
 ## explicit
 github.com/xdg/stringprep
-# golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
+# golang.org/x/crypto v0.0.0-20201216223049-8b5274cf687f
 ## explicit
 golang.org/x/crypto/md4
 golang.org/x/crypto/pbkdf2