Update gemspec from dry-rb/template-gem

Author: File Sync

gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
   spec.metadata["source_code_uri"]   = "https://github.com/dry-rb/dry-testing"
   spec.metadata["bug_tracker_uri"]   = "https://github.com/dry-rb/dry-testing/issues"
 
-  spec.required_ruby_version = ">= 2.7.0"
+  spec.required_ruby_version = ">= 3.0.0"
 
   # to update dependencies edit project.yml