gems: temp disable meta_request gem.

It's not yet compatible with Rails 7.0.

Gemfile.lock

@@ -282,9 +282,6 @@ GEM
     matrix (0.4.2)
     memoist (0.16.2)
     memory_profiler (1.0.0)
-    meta_request (0.7.3)
-      rack-contrib (>= 1.1, < 3)
-      railties (>= 3.0.0, < 7)
     method_source (1.0.0)
     mini_histogram (0.3.1)
     mini_mime (1.1.2)
@@ -344,8 +341,6 @@ GEM
     raabro (1.4.0)
     racc (1.6.0)
     rack (2.2.3)
-    rack-contrib (2.3.0)
-      rack (~> 2.0)
     rack-mini-profiler (2.3.3)
       rack (>= 1.2.0)
     rack-proxy (0.7.0)
@@ -552,7 +547,6 @@ DEPENDENCIES
   mail
   memoist
   memory_profiler
-  meta_request
   minitest-ci
   minitest-reporters
   mocha