Bump net-imap from 0.5.1 to 0.5.2

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.5.1 to 0.5.2.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.5.1...v0.5.2)

---
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

@@ -284,7 +284,7 @@ GEM
       uri
     net-http-persistent (4.0.5)
       connection_pool (~> 2.2)
-    net-imap (0.5.1)
+    net-imap (0.5.2)
       date
       net-protocol
     net-pop (0.1.2)
@@ -560,7 +560,7 @@ GEM
       execjs (>= 0.3.0, < 3)
     thor (1.3.2)
     tilt (2.4.0)
-    timeout (0.4.2)
+    timeout (0.4.3)
     tpm-key_attestation (0.12.1)
       bindata (~> 2.4)
       openssl (> 2.0)