Bump simplecov from 0.15.1 to 0.16.1 in /Library/Homebrew/test

Bumps [simplecov](https://github.com/colszowka/simplecov) from 0.15.1 to 0.16.1.
- [Release notes](https://github.com/colszowka/simplecov/releases)
- [Changelog](https://github.com/colszowka/simplecov/blob/master/CHANGELOG.md)
- [Commits](https://github.com/colszowka/simplecov/compare/v0.15.1...v0.16.1

)

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

Library/Homebrew/test/Gemfile.lock

@@ -7,7 +7,7 @@ GEM
       simplecov
       url
     diff-lcs (1.3)
-    docile (1.1.5)
+    docile (1.3.0)
     json (2.1.0)
     parallel (1.12.1)
     parallel_tests (2.21.2)
@@ -44,8 +44,8 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.9.0)
-    simplecov (0.15.1)
-      docile (~> 1.1.0)
+    simplecov (0.16.1)
+      docile (~> 1.1)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)