Bump bundler to 2.5.10 to ensure fixes work with prism gem

See `rubygems/rubygems#7607`

Gemfile

@@ -29,7 +29,7 @@ gem "awesome_spawn",                    "~>1.6",             :require => false
 gem "aws-sdk-s3",                       "~>1.0",             :require => false # For FileDepotS3
 gem "bcrypt",                           "~> 3.1.10",         :require => false
 gem "bootsnap",                         ">= 1.8.1",          :require => false # for psych 3.3.2+ / 4 unsafe_load
-gem "bundler",                          "~> 2.1", ">= 2.1.4", "!= 2.2.10", :require => false
+gem "bundler",                          ">= 2.5.10",         :require => false
 gem "byebug",                                                :require => false
 gem "color",                            "~>1.8"
 gem "config",                           "~>2.2", ">=2.2.3",  :require => false