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

@@ -40,7 +40,7 @@ gem 'sdoc', :group => :doc
 gem 'spring', :group => :development
 
 # Use ActiveModel has_secure_password
-gem 'bcrypt', '~> 3.1.22'
+gem 'bcrypt', '~> 3.1.7'
 
 # Use unicorn as the app server
 # gem 'unicorn'

Gemfile.lock

@@ -77,7 +77,7 @@ GEM
       uri (>= 0.13.1)
     ast (2.4.3)
     base64 (0.3.0)
-    bcrypt (3.1.22)
+    bcrypt (3.1.21)
     bigdecimal (4.0.1)
     bootsnap (1.23.0)
       msgpack (~> 1.2)
@@ -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)
@@ -349,7 +349,7 @@ PLATFORMS
   x86_64-linux-musl
 
 DEPENDENCIES
-  bcrypt (~> 3.1.22)
+  bcrypt (~> 3.1.7)
   bootsnap
   brakeman
   bullet