Bump bootstrap from 4.5.3 to 4.6.0

Bumps [bootstrap](https://github.com/twbs/bootstrap-rubygem) from 4.5.3 to 4.6.0.
- [Release notes](https://github.com/twbs/bootstrap-rubygem/releases)
- [Changelog](https://github.com/twbs/bootstrap-rubygem/blob/master/CHANGELOG.md)
- [Commits](https://github.com/twbs/bootstrap-rubygem/compare/v4.5.3...v4.6.0)

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

Gemfile.lock

@@ -62,11 +62,11 @@ GEM
       zeitwerk (~> 2.3)
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
-    autoprefixer-rails (10.2.4.0)
+    autoprefixer-rails (10.2.0.0)
       execjs
     bcrypt (3.1.16)
     bindex (0.8.1)
-    bootsnap (1.7.0)
+    bootsnap (1.5.1)
       msgpack (~> 1.0)
     bootstrap (4.6.0)
       autoprefixer-rails (>= 9.1.0)
@@ -109,7 +109,7 @@ GEM
       activesupport (>= 4.2.0)
     hashdiff (1.0.1)
     hashie (4.1.0)
-    i18n (1.8.8)
+    i18n (1.8.7)
       concurrent-ruby (~> 1.0)
     jbuilder (2.10.1)
       activesupport (>= 5.0.0)
@@ -133,7 +133,7 @@ GEM
     mini_mime (1.0.2)
     mini_portile2 (2.5.0)
     minitest (5.14.3)
-    msgpack (1.4.2)
+    msgpack (1.3.3)
     multi_json (1.14.1)
     multi_xml (0.6.0)
     multipart-post (2.1.1)