Bump activesupport from 5.2.3 to 5.2.4.3

Bumps [activesupport](https://github.com/rails/rails) from 5.2.3 to 5.2.4.3.
- [Release notes](https://github.com/rails/rails/releases)
- [Changelog](https://github.com/rails/rails/blob/v6.0.3.1/activesupport/CHANGELOG.md)
- [Commits](rails/rails@v5.2.3...v5.2.4.3)

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

Gemfile.lock

@@ -7,14 +7,14 @@ PATH
 GEM
   remote: http://rubygems.org/
   specs:
-    activesupport (5.2.3)
+    activesupport (5.2.4.3)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     ast (2.4.0)
     backport (1.0.0)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.6)
     coveralls (0.8.22)
       json (>= 1.8, < 3)
       simplecov (~> 0.16.1)
@@ -23,7 +23,7 @@ GEM
       tins (~> 1.6)
     docile (1.3.1)
     htmlentities (4.3.4)
-    i18n (1.6.0)
+    i18n (1.8.2)
       concurrent-ruby (~> 1.0)
     irb (1.0.0)
     jaro_winkler (1.5.2)