Bump activerecord from 4.2.11.1 to 6.1.7.1

Gemfile

@@ -5,7 +5,7 @@ ruby '2.5.7'
 gem "sinatra", :require => 'sinatra/base'
 gem "sinatra-activerecord"
 gem "sinatra-contrib", :require => 'sinatra/contrib/all'
-gem "activerecord", "~> 4.2.11.1"
+gem "activerecord", "~> 6.1.7.1"
 gem "mysql2"
 gem "rdiscount" #markdown support
 gem "yard-sinatra", :require => false # document generation

Gemfile.lock

@@ -1,23 +1,20 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (4.2.11.1)
-      activesupport (= 4.2.11.1)
-      builder (~> 3.1)
-    activerecord (4.2.11.1)
-      activemodel (= 4.2.11.1)
-      activesupport (= 4.2.11.1)
-      arel (~> 6.0)
-    activesupport (4.2.11.1)
-      i18n (~> 0.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
-    arel (6.0.4)
+    activemodel (6.1.7.1)
+      activesupport (= 6.1.7.1)
+    activerecord (6.1.7.1)
+      activemodel (= 6.1.7.1)
+      activesupport (= 6.1.7.1)
+    activesupport (6.1.7.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
     backports (3.15.0)
-    builder (3.2.3)
-    concurrent-ruby (1.1.5)
-    i18n (0.9.5)
+    concurrent-ruby (1.1.10)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     minitest (5.13.0)
     multi_json (1.14.1)
@@ -45,19 +42,19 @@ GEM
       sinatra (= 2.0.7)
       tilt (~> 2.0)
     sqlite3 (1.3.10)
-    thread_safe (0.3.6)
     tilt (2.0.10)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
     yard (0.9.20)
     yard-sinatra (1.0.0)
       yard (~> 0.7)
+    zeitwerk (2.6.6)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  activerecord (~> 4.2.11.1)
+  activerecord (~> 6.1.7.1)
   minitest
   mysql2
   rack-test