build(deps): bump net-imap from 0.6.2 to 0.6.3

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.6.2 to 0.6.3.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.6.2...v0.6.3)

---
updated-dependencies:
- dependency-name: net-imap
  dependency-version: 0.6.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -232,7 +232,7 @@ GEM
       bigdecimal
     net-http (0.9.1)
       uri (>= 0.11.1)
-    net-imap (0.6.2)
+    net-imap (0.6.3)
       date
       net-protocol
     net-pop (0.1.2)