Change from racer to mini_racer for Ruby 3.1 support

Gemfile

@@ -29,7 +29,7 @@ gem 'tracks-chartjs-ror'
 gem 'will_paginate'
 
 # See https://github.com/sstephenson/execjs#readme for more supported runtimes
-gem 'therubyracer', group: :therubyracer
+gem 'mini_racer', group: :therubyracer
 
 # Use --without <group> argument to skip unnecessary drivers
 gem 'sqlite3', group: :sqlite

Gemfile.lock

@@ -151,7 +151,9 @@ GEM
       marcel (~> 1.0.1)
       mime-types
       terrapin (~> 0.6.0)
-    libv8 (3.16.14.19)
+    libv8-node (16.10.0.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -170,6 +172,8 @@ GEM
     mime-types-data (3.2022.0105)
     mini_mime (1.1.2)
     mini_portile2 (2.8.1)
+    mini_racer (0.6.3)
+      libv8-node (~> 16.10.0.0)
     minitest (5.17.0)
     minitest-stub-const (0.6)
     mocha (2.0.2)
@@ -243,7 +247,6 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rbs (2.8.4)
-    ref (2.0.0)
     regexp_parser (2.8.0)
     reverse_markdown (2.1.1)
       nokogiri
@@ -314,9 +317,6 @@ GEM
       unicode-display_width (>= 1.1.1, < 3)
     terrapin (0.6.0)
       climate_control (>= 0.0.3, < 1.0)
-    therubyracer (0.12.3)
-      libv8 (~> 3.16.14.15)
-      ref
     thor (1.2.1)
     thread_safe (0.3.6)
     tilt (2.1.0)
@@ -364,6 +364,7 @@ DEPENDENCIES
   jquery-ui-rails (~> 6.0.1)
   kt-paperclip (~> 7.1)
   listen
+  mini_racer
   minitest-stub-const
   mocha
   mysql2 (~> 0.5.5)
@@ -382,7 +383,6 @@ DEPENDENCIES
   solargraph
   spring (~> 4)
   sqlite3
-  therubyracer
   tolk (~> 5.0.0)
   tracks-chartjs-ror
   uglifier (>= 1.3.0)