Bump msgpack from 1.8.0 to 1.8.1

Bumps [msgpack](https://github.com/msgpack/msgpack-ruby) from 1.8.0 to 1.8.1.
- [Changelog](https://github.com/msgpack/msgpack-ruby/blob/master/ChangeLog)
- [Commits](https://github.com/msgpack/msgpack-ruby/compare/v1.8.0...v1.8.1)

---
updated-dependencies:
- dependency-name: msgpack
  dependency-version: 1.8.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -436,7 +436,7 @@ GEM
     mini_mime (1.1.5)
     mini_portile2 (2.8.9)
     minitest (5.27.0)
-    msgpack (1.8.0)
+    msgpack (1.8.1)
     multi_json (1.19.1)
     multi_xml (0.8.1)
       bigdecimal (>= 3.1, < 5)