DEV: Bump msgpack from 1.3.2 to 1.3.3 (#8859)

Bumps [msgpack](https://github.com/msgpack/msgpack-ruby) from 1.3.2 to 1.3.3.
- [Release notes](https://github.com/msgpack/msgpack-ruby/releases)
- [Changelog](https://github.com/msgpack/msgpack-ruby/blob/master/ChangeLog)
- [Commits](https://github.com/msgpack/msgpack-ruby/compare/v1.3.2...v1.3.3)

Very safe update, mostly covering 2.7 compat.

Gemfile.lock

@@ -198,7 +198,7 @@ GEM
     mocha (1.8.0)
       metaclass (~> 0.0.1)
     mock_redis (0.22.0)
-    msgpack (1.3.2)
+    msgpack (1.3.3)
     multi_json (1.14.1)
     multi_xml (0.6.0)
     multipart-post (2.1.1)