Bump net-imap from 0.4.14 to 0.4.15 (#1151)

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.4.14 to 0.4.15.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.4.14...v0.4.15)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -132,7 +132,7 @@ GEM
     mini_portile2 (2.8.7)
     minitest (5.25.1)
     msgpack (1.7.2)
-    net-imap (0.4.14)
+    net-imap (0.4.15)
       date
       net-protocol
     net-pop (0.1.2)
@@ -420,7 +420,7 @@ CHECKSUMS
   mini_portile2 (2.8.7) sha256=13eef5ab459bbfd33d61e539564ec25a9c2cf593b0a5ea6d4d7ef8c19b162ee0
   minitest (5.25.1) sha256=3db6795a80634def1cf86fda79d2d83b59b25ce5e186fa675f73c565589d2ad8
   msgpack (1.7.2) sha256=59ab62fd8a4d0dfbde45009f87eb6f158ab2628a7c48886b0256f175166baaa8
-  net-imap (0.4.14) sha256=a2184b3f09a4f7ca27998d113fd6df8cd0dd56b91e5bf0d6387b8350bb438065
+  net-imap (0.4.15) sha256=e468121d50cfcf82b7bbcee823d352bbb62ba8add963daa0c08d21680d83b53d
   net-pop (0.1.2) sha256=848b4e982013c15b2f0382792268763b748cce91c9e91e36b0f27ed26420dff3
   net-protocol (0.2.2) sha256=aa73e0cba6a125369de9837b8d8ef82a61849360eba0521900e2c3713aa162a8
   net-scp (4.0.0) sha256=b32ded0d48c88ce70844a063e4e14efb44a95e51a9e0c0bfb0c54b4313b622ea