Bump bootstrap from 4.6.0 to 5.0.1

Bumps [bootstrap](https://github.com/twbs/bootstrap-rubygem) from 4.6.0 to 5.0.1.
- [Release notes](https://github.com/twbs/bootstrap-rubygem/releases)
- [Changelog](https://github.com/twbs/bootstrap-rubygem/blob/master/CHANGELOG.md)
- [Commits](twbs/bootstrap-rubygem@v4.6.0...v5.0.1)

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

Gemfile.lock

@@ -70,8 +70,8 @@ GEM
       activerecord (>= 3.2, < 7.0)
       rake (>= 10.4, < 14.0)
     ast (2.4.2)
-    autoprefixer-rails (10.2.0.0)
-      execjs
+    autoprefixer-rails (10.2.5.0)
+      execjs (< 2.8.0)
     axiom-types (0.1.1)
       descendants_tracker (~> 0.0.4)
       ice_nine (~> 0.11.0)
@@ -81,9 +81,9 @@ GEM
     bindex (0.8.1)
     bootsnap (1.7.5)
       msgpack (~> 1.0)
-    bootstrap (4.6.0)
+    bootstrap (5.0.1)
       autoprefixer-rails (>= 9.1.0)
-      popper_js (>= 1.14.3, < 2)
+      popper_js (>= 2.9.2, < 3)
       sassc-rails (>= 2.0.0)
     brakeman (5.0.1)
     builder (3.2.4)
@@ -209,7 +209,7 @@ GEM
     path_expander (1.1.0)
     pg (1.2.3)
     polyfill (1.9.0)
-    popper_js (1.16.0)
+    popper_js (2.9.2)
     prettier (1.5.5)
     psych (3.3.1)
     public_suffix (4.0.6)