Bump bootstrap_form from 4.4.0 to 4.5.0

Bumps [bootstrap_form](https://github.com/bootstrap-ruby/bootstrap_form) from 4.4.0 to 4.5.0.
- [Release notes](https://github.com/bootstrap-ruby/bootstrap_form/releases)
- [Changelog](https://github.com/bootstrap-ruby/bootstrap_form/blob/master/CHANGELOG.md)
- [Commits](bootstrap-ruby/bootstrap_form@v4.4.0...v4.5.0)

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

Gemfile.lock

@@ -57,9 +57,9 @@ GEM
     bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
       sassc (>= 2.0.0)
-    bootstrap_form (4.4.0)
-      actionpack (>= 5.0)
-      activemodel (>= 5.0)
+    bootstrap_form (4.5.0)
+      actionpack (>= 5.2)
+      activemodel (>= 5.2)
     builder (3.2.4)
     bundler-audit (0.6.1)
       bundler (>= 1.2.0, < 3)