build(deps): bump nodemailer from 4.6.4 to 6.4.16

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 4.6.4 to 6.4.16.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v4.6.4...v6.4.16)

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -31,7 +31,7 @@
     "morgan": "^1.9.1",
     "multer": "^1.3.0",
     "nocache": "^2.0.0",
-    "nodemailer": "^4.2.0",
+    "nodemailer": "^6.4.16",
     "outdatedbrowser": "^1.1.5",
     "passport": "^0.4.0",
     "passport-google-oauth": "^1.0.0",

yarn.lock

@@ -2483,9 +2483,10 @@ nocache@^2.0.0:
   resolved "https://registry.yarnpkg.com/nocache/-/nocache-2.1.0.tgz#120c9ffec43b5729b1d5de88cd71aa75a0ba491f"
   integrity sha512-0L9FvHG3nfnnmaEQPjT9xhfN4ISk0A8/2j4M37Np4mcDesJjHgEUfgPhdCyZuFI954tjokaIj/A3NdpFNdEh4Q==
 
-nodemailer@^4.2.0:
-  version "4.6.5"
-  resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-4.6.5.tgz#306ce18c4543f3f06e5f76665d3cb6277f872f53"
+nodemailer@^6.4.16:
+  version "6.4.16"
+  resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-6.4.16.tgz#5cb6391b1d79ab7eff32d6f9f48366b5a7117293"
+  integrity sha512-68K0LgZ6hmZ7PVmwL78gzNdjpj5viqBdFqKrTtr9bZbJYj6BRj5W6WGkxXrEnUl3Co3CBXi3CZBUlpV/foGnOQ==
 
 nopt@~3.0.6:
   version "3.0.6"