TECH-19528: add mutex_m gem because of some ruby versions

Author: ColinDKelley

Gemfile

@@ -9,6 +9,7 @@ gem 'coveralls', require: false
 gem 'appraisal'
 gem 'appraisal-matrix'
 gem 'bump', '~> 0.6.1'
+gem 'mutex_m'
 gem 'pry'
 gem 'rake'
 gem 'rubocop', '0.54.0'

Gemfile.lock

@@ -50,6 +50,7 @@ GEM
     logger (1.7.0)
     method_source (1.0.0)
     minitest (5.25.5)
+    mutex_m (0.3.0)
     parallel (1.23.0)
     parser (3.2.2.3)
       ast (~> 2.4.1)
@@ -115,6 +116,7 @@ DEPENDENCIES
   bump (~> 0.6.1)
   contextual_logger!
   coveralls
+  mutex_m
   pry
   rake
   rspec