Bump net-imap from 0.5.5 to 0.5.6

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.5.5 to 0.5.6.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.5.5...v0.5.6)

---
updated-dependencies:
- dependency-name: net-imap
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -185,7 +185,7 @@ GEM
     multipart-post (2.4.1)
     net-http (0.6.0)
       uri
-    net-imap (0.5.5)
+    net-imap (0.5.6)
       date
       net-protocol
     net-pop (0.1.2)
@@ -486,7 +486,7 @@ CHECKSUMS
   msgpack (1.8.0) sha256=e64ce0212000d016809f5048b48eb3a65ffb169db22238fb4b72472fecb2d732
   multipart-post (2.4.1) sha256=9872d03a8e552020ca096adadbf5e3cb1cd1cdd6acd3c161136b8a5737cdb4a8
   net-http (0.6.0) sha256=9621b20c137898af9d890556848c93603716cab516dc2c89b01a38b894e259fb
-  net-imap (0.5.5) sha256=abe6a8932c68269804b0f0b499a0d1972098e7e6b8b61a7c508b127ebde1682a
+  net-imap (0.5.6) sha256=1ede8048ee688a14206060bf37a716d18cb6ea00855f6c9b15daee97ee51fbe5
   net-pop (0.1.2) sha256=848b4e982013c15b2f0382792268763b748cce91c9e91e36b0f27ed26420dff3
   net-protocol (0.2.2) sha256=aa73e0cba6a125369de9837b8d8ef82a61849360eba0521900e2c3713aa162a8
   net-smtp (0.5.1) sha256=ed96a0af63c524fceb4b29b0d352195c30d82dd916a42f03c62a3a70e5b70736