Bump net-imap from 0.6.3 to 0.6.4

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.6.3 to 0.6.4.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](https://github.com/ruby/net-imap/compare/v0.6.3...v0.6.4)

---
updated-dependencies:
- dependency-name: net-imap
  dependency-version: 0.6.4
  dependency-type: indirect
...

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

Gemfile.lock

@@ -162,7 +162,7 @@ GEM
     msgpack (1.8.0)
     mysql2 (0.5.7)
       bigdecimal
-    net-imap (0.6.3)
+    net-imap (0.6.4)
       date
       net-protocol
     net-pop (0.1.2)
@@ -317,7 +317,7 @@ GEM
       railties (>= 6.0.0)
     stringio (3.2.0)
     thor (1.5.0)
-    timeout (0.6.0)
+    timeout (0.6.1)
     tsort (0.2.0)
     turbo-rails (2.0.23)
       actionpack (>= 7.1.0)