build(deps-dev): update ruby_memcheck requirement from 2.3.0 to 3.0.0

Updates the requirements on [ruby_memcheck](https://github.com/Shopify/ruby_memcheck) to permit the latest version.
- [Release notes](https://github.com/Shopify/ruby_memcheck/releases)
- [Commits](Shopify/ruby_memcheck@2.3.0...3.0.0)

---
updated-dependencies:
- dependency-name: ruby_memcheck
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile

@@ -8,7 +8,7 @@ group :development do
   gem "rake-compiler", "1.2.7"
   gem "rake-compiler-dock", "1.5.0"
 
-  gem "ruby_memcheck", "2.3.0" if Gem::Platform.local.os == "linux"
+  gem "ruby_memcheck", "3.0.0" if Gem::Platform.local.os == "linux"
 
   gem "rdoc", "6.6.3.1"