build: drop base64 dep in GN build

PR-URL: nodejs#52856
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz.nizipli@sentry.io>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>

unofficial.gni

@@ -139,7 +139,6 @@ template("node_gn_build") {
     public_deps = [
       "deps/ada",
       "deps/uv",
-      "deps/base64",
       "deps/simdjson",
       "$node_v8_path",
     ]