Bump simple_form from 3.5.1 to 5.0.0

Bumps [simple_form](https://github.com/plataformatec/simple_form) from 3.5.1 to 5.0.0.
- [Release notes](https://github.com/plataformatec/simple_form/releases)
- [Changelog](https://github.com/heartcombo/simple_form/blob/master/CHANGELOG.md)
- [Commits](heartcombo/simple_form@v3.5.1...v5.0.0)

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

Gemfile.lock

@@ -368,9 +368,9 @@ GEM
     shellany (0.0.1)
     shoulda-matchers (3.1.2)
       activesupport (>= 4.0.0)
-    simple_form (3.5.1)
-      actionpack (> 4, < 5.2)
-      activemodel (> 4, < 5.2)
+    simple_form (5.0.0)
+      actionpack (>= 5.0)
+      activemodel (>= 5.0)
     simple_oauth (0.3.1)
     simplecov (0.15.1)
       docile (~> 1.1.0)