Bump matrix from 0.4.2 to 0.4.3

Bumps [matrix](https://github.com/ruby/matrix) from 0.4.2 to 0.4.3.
- [Release notes](https://github.com/ruby/matrix/releases)
- [Changelog](https://github.com/ruby/matrix/blob/master/CHANGELOG.md)
- [Commits](ruby/matrix@v0.4.2...v0.4.3)

---
updated-dependencies:
- dependency-name: matrix
  dependency-version: 0.4.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -389,7 +389,7 @@ GEM
       net-pop
       net-smtp
     marcel (1.0.4)
-    matrix (0.4.2)
+    matrix (0.4.3)
     memflash (2.6.0)
       actionpack (>= 7.0)
     memory_profiler (1.1.0)