Bump bootstrap from 4.0.0 to 4.1.1

Bumps [bootstrap](https://github.com/twbs/bootstrap-rubygem) from 4.0.0 to 4.1.1.
- [Release notes](https://github.com/twbs/bootstrap-rubygem/releases)
- [Changelog](https://github.com/twbs/bootstrap-rubygem/blob/master/CHANGELOG.md)
- [Commits](twbs/bootstrap-rubygem@v4.0.0...v4.1.1)

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

Gemfile

@@ -18,7 +18,7 @@ gem 'slim-rails'
 gem 'kaminari'
 
 # Styling
-gem 'bootstrap', '~> 4.0.0'
+gem 'bootstrap', '~> 4.1.1'
 gem 'bootswatch'
 gem 'jquery-rails'
 gem 'popper_js', '~> 1.12.9'

Gemfile.lock

@@ -45,7 +45,7 @@ GEM
     autoprefixer-rails (8.4.1)
       execjs
     bindex (0.5.0)
-    bootstrap (4.0.0)
+    bootstrap (4.1.1)
       autoprefixer-rails (>= 6.0.3)
       popper_js (>= 1.12.9, < 2)
       sass (>= 3.5.2)
@@ -232,7 +232,7 @@ PLATFORMS
 
 DEPENDENCIES
   autoprefixer-rails
-  bootstrap (~> 4.0.0)
+  bootstrap (~> 4.1.1)
   bootswatch
   byebug
   capybara (~> 2.18)