build(deps): bump nodemailer from 6.7.2 to 6.7.3 (#22)

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.7.2 to 6.7.3.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v6.7.2...v6.7.3)

---
updated-dependencies:
- dependency-name: nodemailer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -7,7 +7,7 @@
   "dependencies": {
     "@actions/core": "^1.6.0",
     "@actions/glob": "^0.2.1",
-    "nodemailer": "^6.7.2",
+    "nodemailer": "^6.7.3",
     "showdown": "^2.0.2",
     "dotenv": "^16.0.0"
   }