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: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -286,7 +286,7 @@ GEM
       uri
     net-http-persistent (4.0.5)
       connection_pool (~> 2.2)
-    net-imap (0.5.5)
+    net-imap (0.5.6)
       date
       net-protocol
     net-pop (0.1.2)
@@ -812,7 +812,7 @@ CHECKSUMS
   nested_form (0.3.2) sha256=b1c468d7eac781235861c2f74fc9f675df0c4d915d5724aaf7fd29f7891c0538
   net-http (0.6.0) sha256=9621b20c137898af9d890556848c93603716cab516dc2c89b01a38b894e259fb
   net-http-persistent (4.0.5) sha256=6e42880b347e650ffeaf679ae59c9d5a6ed8a22cda6e1b959d9c270050aefa8e
-  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