Update ignores

* `.gemspec`: don’t include `test/`, `rbs_collection.yaml` and `    Steepfile`
* `.gitignore`: also ignore matches in subdirectories

Author: ParadoxV5

.gitignore

@@ -1,10 +1,10 @@
 # VSCode
-/.vscode/
+.vscode/
 # JetBrains
-/.idea/
+.idea/
 
 # Ruby
-/Gemfile.lock
+Gemfile.lock
 # https://github.com/ruby/gem_rbs_collection
-/.gem_rbs_collection/
-/rbs_collection.lock.yaml
+.gem_rbs_collection/
+rbs_collection.lock.yaml

mygem.gemspec

@@ -19,7 +19,11 @@ Gem::Specification.new do|spec|
     'documentation_uri' => "https://rubydoc.info/gems/#{spec.name}"
   }
 
-  spec.files = Dir['**/*']
+  spec.files = Dir['**/*'].grep_v Regexp.union *%w[
+    test/
+    rbs_collection.yaml
+    Steepfile
+  ]
 
   spec.required_ruby_version = '~> 3.1'
   #spec.add_dependency 'dependency_gem', '~> 2.1.0'