Skip cookie comma separation test

Rack updated the RFC they're adhering to when parsing cookies, now no
longer including commas.

There's still an open question as mentioned in:
https://github.com/rails/rails/issues/38420

However, the resilience test is no longer as well needed as it once was
and we can move forward separately. If not, this is easily revertible.

Gemfile.lock

@@ -367,7 +367,7 @@ GEM
       thor
     raabro (1.1.6)
     racc (1.4.16)
-    rack (2.1.1)
+    rack (2.2.1)
     rack-cache (1.10.0)
       rack (>= 0.4)
     rack-protection (2.0.7)
@@ -609,4 +609,4 @@ DEPENDENCIES
   websocket-client-simple!
 
 BUNDLED WITH
-   2.1.2
+   2.1.4

actionpack/test/dispatch/request_test.rb

@@ -592,12 +592,6 @@ class RequestCookie < BaseRequestTest
     request = stub_request("HTTP_COOKIE" => "_session_id=c84ace84796670c052c6ceb2451fb0f2; is_admin=yes")
     assert_equal "c84ace84796670c052c6ceb2451fb0f2", request.cookies["_session_id"], request.cookies.inspect
     assert_equal "yes", request.cookies["is_admin"], request.cookies.inspect
-
-    # some Nokia phone browsers omit the space after the semicolon separator.
-    # some developers have grown accustomed to using comma in cookie values.
-    request = stub_request("HTTP_COOKIE" => "_session_id=c84ace847,96670c052c6ceb2451fb0f2;is_admin=yes")
-    assert_equal "c84ace847", request.cookies["_session_id"], request.cookies.inspect
-    assert_equal "yes", request.cookies["is_admin"], request.cookies.inspect
   end
 end