⬆️ Bump codecov and simplecov

Bumps [codecov](https://github.com/codecov/codecov-ruby) and [simplecov](https://github.com/simplecov-ruby/simplecov). These dependencies needed to be updated together.

Updates `codecov` from 0.2.12 to 0.6.0
- [Release notes](https://github.com/codecov/codecov-ruby/releases)
- [Changelog](https://github.com/codecov/codecov-ruby/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-ruby@v0.2.12...v0.6.0)

Updates `simplecov` from 0.22.0 to 0.21.2
- [Release notes](https://github.com/simplecov-ruby/simplecov/releases)
- [Changelog](https://github.com/simplecov-ruby/simplecov/blob/main/CHANGELOG.md)
- [Commits](simplecov-ruby/simplecov@v0.22.0...v0.21.2)

---
updated-dependencies:
- dependency-name: codecov
  dependency-type: direct:development
  update-type: version-update:semver-minor
- dependency-name: simplecov
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -22,9 +22,8 @@ GEM
     aws-sigv4 (1.6.0)
       aws-eventstream (~> 1, >= 1.0.2)
     byebug (11.1.3)
-    codecov (0.2.12)
-      json
-      simplecov
+    codecov (0.6.0)
+      simplecov (>= 0.15, < 0.22)
     coderay (1.1.3)
     concurrent-ruby (1.2.2)
     connection_pool (2.4.1)
@@ -79,7 +78,6 @@ GEM
       concurrent-ruby (~> 1.0)
     ice_nine (0.11.2)
     jmespath (1.6.2)
-    json (2.6.3)
     listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -161,7 +159,7 @@ GEM
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
     shellany (0.0.1)
-    simplecov (0.22.0)
+    simplecov (0.21.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)