Bump Liquid to 5.11.0 (#2012)

This commit reverts the Inline Snippets tag (#2001) and bumps
Liquid to 5.11. For now, the inclusion of Inline Snippets
in the latest Liquid release is being treated as a bug.

While #2001 does implement the scope contained in RFC#1916,
we need to take a step back to make sure we’re setting our
sights high enough with this feature, and that we’re truly
supporting theme developers in the ways they need.

If you have any feedback, please leave a comment on RFC#1916.

- Liquid Developer Tools

Rakefile

@@ -33,7 +33,7 @@ task :rubocop do
   end
 end
 
-desc('runs test suite with lax, strict, and rigid parsers')
+desc('runs test suite with lax, strict, and strict2 parsers')
 task :test do
   ENV['LIQUID_PARSER_MODE'] = 'lax'
   Rake::Task['base_test'].invoke
@@ -42,7 +42,7 @@ task :test do
   Rake::Task['base_test'].reenable
   Rake::Task['base_test'].invoke
 
-  ENV['LIQUID_PARSER_MODE'] = 'rigid'
+  ENV['LIQUID_PARSER_MODE'] = 'strict2'
   Rake::Task['base_test'].reenable
   Rake::Task['base_test'].invoke
 
@@ -55,7 +55,7 @@ task :test do
     Rake::Task['integration_test'].reenable
     Rake::Task['integration_test'].invoke
 
-    ENV['LIQUID_PARSER_MODE'] = 'rigid'
+    ENV['LIQUID_PARSER_MODE'] = 'strict2'
     Rake::Task['integration_test'].reenable
     Rake::Task['integration_test'].invoke
   end
@@ -88,13 +88,13 @@ namespace :benchmark do
     ruby "./performance/benchmark.rb strict"
   end
 
-  desc "Run the liquid benchmark with rigid parsing"
-  task :rigid do
-    ruby "./performance/benchmark.rb rigid"
+  desc "Run the liquid benchmark with strict2 parsing"
+  task :strict2 do
+    ruby "./performance/benchmark.rb strict2"
   end
 
-  desc "Run the liquid benchmark with lax, strict, and rigid parsing"
-  task run: [:lax, :strict, :rigid]
+  desc "Run the liquid benchmark with lax, strict, and strict2 parsing"
+  task run: [:lax, :strict, :strict2]
 
   desc "Run unit benchmarks"
   namespace :unit do