Bump net-imap from 0.4.1 to 0.4.20

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.4.1 to 0.4.20.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.4.1...v0.4.20)

---
updated-dependencies:
- dependency-name: net-imap
  dependency-version: 0.4.20
  dependency-type: indirect
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -125,7 +125,7 @@ GEM
       activerecord (>= 5.a)
       database_cleaner-core (~> 2.0.0)
     database_cleaner-core (2.0.1)
-    date (3.3.3)
+    date (3.4.1)
     devise (4.8.1)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
@@ -202,12 +202,12 @@ GEM
     minitest (5.20.0)
     multi_xml (0.6.0)
     mutex_m (0.1.2)
-    net-imap (0.4.1)
+    net-imap (0.4.20)
       date
       net-protocol
     net-pop (0.1.2)
       net-protocol
-    net-protocol (0.2.1)
+    net-protocol (0.2.2)
       timeout
     net-smtp (0.4.0)
       net-protocol
@@ -422,7 +422,7 @@ GEM
       execjs (>= 0.3.0, < 3)
     thor (1.2.2)
     tilt (2.3.0)
-    timeout (0.4.0)
+    timeout (0.4.3)
     turbolinks (5.2.1)
       turbolinks-source (~> 5.2)
     turbolinks-source (5.2.0)