DEV: update rack-mini-profiler (#11597)

Included support for flamegraphs using speedscope!

Gemfile

@@ -192,7 +192,6 @@ gem 'htmlentities', require: false
 #  If you want to amend mini profiler to do the monkey patches in the railties
 #  we are open to it. by deferring require to the initializer we can configure discourse installs without it
 
-gem 'flamegraph', require: false
 gem 'rack-mini-profiler', require: ['enable_rails_patches']
 
 gem 'unicorn', require: false, platform: :ruby

Gemfile.lock

@@ -133,7 +133,6 @@ GEM
     fast_xs (0.8.0)
     fastimage (2.2.0)
     ffi (1.14.2)
-    flamegraph (0.9.5)
     fspath (3.1.2)
     gc_tracer (1.5.1)
     globalid (0.4.2)
@@ -265,7 +264,7 @@ GEM
       nio4r (~> 2.0)
     r2 (0.2.7)
     rack (2.2.3)
-    rack-mini-profiler (2.2.1)
+    rack-mini-profiler (2.3.0)
       rack (>= 1.2.0)
     rack-protection (2.1.0)
       rack
@@ -472,7 +471,6 @@ DEPENDENCIES
   fast_blank
   fast_xs
   fastimage
-  flamegraph
   gc_tracer
   highline
   htmlentities
@@ -559,4 +557,4 @@ DEPENDENCIES
   yaml-lint
 
 BUNDLED WITH
-   2.1.4
+   2.2.2

config/initializers/006-mini_profiler.rb

@@ -3,7 +3,7 @@
 # If Mini Profiler is included via gem
 if Rails.configuration.respond_to?(:load_mini_profiler) && Rails.configuration.load_mini_profiler
   require 'rack-mini-profiler'
-  require 'flamegraph'
+  require 'stackprof'
 
   begin
     require 'memory_profiler'