Bump net-imap from 0.4.16 to 0.4.19 in /examples/simple_rails_api

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.4.16 to 0.4.19.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.4.16...v0.4.19)

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

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

Author: dependabot[bot]

examples/simple_rails_api/Gemfile.lock

@@ -66,7 +66,7 @@ GEM
     byebug (11.1.3)
     concurrent-ruby (1.3.4)
     crass (1.0.6)
-    date (3.3.4)
+    date (3.4.1)
     erubi (1.13.0)
     ffi (1.15.4)
     globalid (1.2.1)
@@ -90,7 +90,7 @@ GEM
     mini_portile2 (2.8.7)
     minitest (5.25.1)
     msgpack (1.4.2)
-    net-imap (0.4.16)
+    net-imap (0.4.19)
       date
       net-protocol
     net-pop (0.1.2)
@@ -154,7 +154,7 @@ GEM
       sprockets (>= 3.0.0)
     sqlite3 (1.4.2)
     thor (1.3.2)
-    timeout (0.4.1)
+    timeout (0.4.3)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     websocket-driver (0.7.6)