ruby_3_0: drop

Ruby EOL is 31 March 2024, that is, during NixOS 23.11.
We drop it early now to avoid any problem during the release time.

pkgs/development/interpreters/ruby/default.nix

···
   config = import ./config.nix { inherit fetchFromSavannah; };
   rubygems = import ./rubygems { inherit stdenv lib fetchurl; };
 
-  openssl3Gem = fetchFromGitHub {
-    owner = "ruby";
-    repo = "openssl";
-    rev = "v3.0.2";
-    hash = "sha256-KhuKRP1JkMJv7CagGRQ0KKGOd5Oh0FP0fbj0VZ4utGo=";
-  };
-
   # Contains the ruby version heuristics
   rubyVersion = import ./ruby-version.nix { inherit lib; };
 
···
           rm -rf $sourceRoot/{lib,test}/rubygems*
           cp -r ${rubygems}/lib/rubygems* $sourceRoot/lib
           cp -r ${rubygems}/test/rubygems $sourceRoot/test
-        '' + opString (ver.majMin == "3.0" && opensslSupport) ''
-          # Replace the Gem by a OpenSSL3-compatible one.
-          echo "Hotpatching the OpenSSL gem with a 3.x series for OpenSSL 3 support..."
-          cp -vr ${openssl3Gem}/ext/openssl $sourceRoot/ext/
-          cp -vr ${openssl3Gem}/lib/ $sourceRoot/ext/openssl/
-          cp -vr ${openssl3Gem}/{History.md,openssl.gemspec} $sourceRoot/ext/openssl/
         '';
 
         postPatch = ''
···
   ruby_2_7 = generic {
     version = rubyVersion "2" "7" "8" "";
     sha256 = "sha256-wtq2PLyPKgVSYQitQZ76Y6Z+1AdNu8+fwrHKZky0W6A=";
-  };
-
-  ruby_3_0 = generic {
-    version = rubyVersion "3" "0" "6" "";
-    sha256 = "sha256-bmy9SQAw15EMD/IO3vq0KU380QRvD49H94tZeYesaD4=";
   };
 
   ruby_3_1 = generic {

pkgs/top-level/all-packages.nix

···
     mkRubyVersion
     mkRuby
     ruby_2_7
-    ruby_3_0
     ruby_3_1
     ruby_3_2
     ruby_3_3;
···
   rubyPackages = rubyPackages_3_1;
 
   rubyPackages_2_7 = recurseIntoAttrs ruby_2_7.gems;
-  rubyPackages_3_0 = recurseIntoAttrs ruby_3_0.gems;
   rubyPackages_3_1 = recurseIntoAttrs ruby_3_1.gems;
   rubyPackages_3_2 = recurseIntoAttrs ruby_3_2.gems;
   rubyPackages_3_3 = recurseIntoAttrs ruby_3_3.gems;

pkgs/top-level/pkg-config/pkg-config-data.json

···
         "ruby_2_7"
       ]
     },
-    "ruby-3.0": {
-      "attrPath": [
-        "ruby_3_0"
-      ]
-    },
     "ruby-3.1": {
       "attrPath": [
         "ruby_3_1"