Bump activesupport from 6.0.3 to 6.0.3.1 in /misc/slack_ruby_app

Bumps [activesupport](https://github.com/rails/rails) from 6.0.3 to 6.0.3.1.
- [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@v6.0.3...v6.0.3.1)

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

Author: dependabot[bot]

misc/slack_ruby_app/Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (6.0.3)
+    activesupport (6.0.3.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -16,7 +16,7 @@ GEM
     hashie (4.1.0)
     i18n (1.8.2)
       concurrent-ruby (~> 1.0)
-    minitest (5.14.0)
+    minitest (5.14.1)
     multipart-post (2.1.1)
     mustermann (1.0.3)
     rack (2.0.8)