Bump minitest from 5.16.2 to 5.16.3

Bumps [minitest](https://github.com/seattlerb/minitest) from 5.16.2 to 5.16.3.
- [Release notes](https://github.com/seattlerb/minitest/releases)
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](minitest/minitest@v5.16.2...v5.16.3)

---
updated-dependencies:
- dependency-name: minitest
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -132,7 +132,7 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.2)
     mini_portile2 (2.8.0)
-    minitest (5.16.2)
+    minitest (5.16.3)
     mocha (1.14.0)
     msgpack (1.5.4)
     net-imap (0.2.3)