Upgrade: Bump simplecov from 0.19.1 to 0.21.2

Bumps [simplecov](https://github.com/simplecov-ruby/simplecov) from 0.19.1 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](https://github.com/simplecov-ruby/simplecov/compare/v0.19.1...v0.21.2)

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

Gemfile.lock

@@ -167,7 +167,7 @@ GEM
     devise_invitable (1.7.5)
       actionmailer (>= 4.1.0)
       devise (>= 4.0.0)
-    docile (1.3.2)
+    docile (1.3.4)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
     dry-configurable (0.11.6)
@@ -561,10 +561,12 @@ GEM
     simple_form (3.5.1)
       actionpack (> 4, < 5.2)
       activemodel (> 4, < 5.2)
-    simplecov (0.19.1)
+    simplecov (0.21.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.2)
     spring (2.0.2)
       activesupport (>= 4.2)
     sprockets (3.7.2)