⚒️ install bootstrap per Hyrax upgrade instructions

This commit upgrade bootstrap per the 'Upgrade Hyrax 3.x to Hyrax 4' wiki instructions.

wiki:
- https://github.com/samvera/hyrax/wiki/Upgrade-Hyrax-3.x-to-Hyrax-4

Issue:
- scientist-softserv#22

Gemfile

@@ -13,6 +13,7 @@ if ENV['DEPENDENCIES_NEXT'] && !ENV['DEPENDENCIES_NEXT'].empty?
   gem 'hyrax', '~> 4.0'
   # Use SCSS for stylesheets
   gem 'sass-rails', '~> 6.0'
+  gem 'bootstrap', '~> 4.0'
   gem 'sony_ci_api', github: 'WGBH-MLA/sony_ci_api_rewrite', branch: 'main'
   gem 'hydra-role-management', '1.1.0'
   gem 'blacklight', '~> 7.29'

Gemfile_next.lock

@@ -135,10 +135,12 @@ GEM
     almond-rails (0.3.0)
       rails (>= 4.2)
     ast (2.4.2)
+    autoprefixer-rails (10.4.13.0)
+      execjs (~> 2)
     awesome_nested_set (3.5.0)
       activerecord (>= 4.0.0, < 7.1)
     aws-eventstream (1.2.0)
-    aws-partitions (1.799.0)
+    aws-partitions (1.800.0)
     aws-sdk-codedeploy (1.57.0)
       aws-sdk-core (~> 3, >= 3.177.0)
       aws-sigv4 (~> 1.1)
@@ -187,12 +189,16 @@ GEM
       blacklight (> 6.0, < 8)
       cancancan (>= 1.8)
       deprecation (~> 1.0)
-    blacklight-gallery (4.0.2)
-      blacklight (~> 7.17)
-      rails (>= 5.1, < 8)
+    blacklight-gallery (4.3.0)
+      blacklight (>= 7.17, < 9)
+      rails (>= 6.1, < 8)
     blacklight_advanced_search (7.0.0)
       blacklight (~> 7.0)
       parslet
+    bootstrap (4.6.2)
+      autoprefixer-rails (>= 9.1.0)
+      popper_js (>= 1.16.1, < 2)
+      sassc-rails (>= 2.0.0)
     bootstrap-multiselect-rails (0.9.9)
       rails (>= 4.0.0)
     bootstrap_form (5.1.0)
@@ -700,6 +706,7 @@ GEM
       faker (~> 1.9)
       nokogiri (~> 1.10)
       sax-machine (~> 1.3)
+    popper_js (1.16.1)
     posix-spawn (0.3.15)
     pry (0.14.2)
       coderay (~> 1.1)
@@ -1124,6 +1131,7 @@ DEPENDENCIES
   bixby
   blacklight (~> 7.29)
   blacklight_advanced_search (= 7.0)
+  bootstrap (~> 4.0)
   bootstrap-multiselect-rails
   bulkrax!
   capybara (~> 3.0)