build(deps): Bump net-imap from 0.4.17 to 0.4.18 in the net-gem group

Bumps the net-gem group with 1 update: [net-imap](https://github.com/ruby/net-imap).


Updates `net-imap` from 0.4.17 to 0.4.18
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.4.17...v0.4.18)

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

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

Gemfile

@@ -46,5 +46,5 @@ group :rubocop do
   gem "rubocop"
 end
 
-gem "net-imap", "~> 0.4.17"
+gem "net-imap", "~> 0.4.18"
 gem "zeitwerk", "~> 2.6.0"

Gemfile.lock

@@ -141,7 +141,7 @@ GEM
     mini_portile2 (2.8.8)
     minitest (5.25.1)
     msgpack (1.7.3)
-    net-imap (0.4.17)
+    net-imap (0.4.18)
       date
       net-protocol
     net-pop (0.1.2)
@@ -334,7 +334,7 @@ DEPENDENCIES
   image_processing
   inline_svg
   listen
-  net-imap (~> 0.4.17)
+  net-imap (~> 0.4.18)
   puma
   rack-mini-profiler
   rails (~> 6.1.7.10)