CI: check_dependencies.yml is now required [ci skip]

`paths-ignore` cannot be used for required status checks.

.github/workflows/check_dependencies.yml

@@ -9,13 +9,6 @@ on:
       - '**/.document'
       - '.*.yml'
   pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
   merge_group:
 
 concurrency:

lib/pp.gemspec

@@ -22,8 +22,7 @@ Gem::Specification.new do |spec|
   spec.metadata["source_code_uri"] = spec.homepage
 
   spec.files         = %w[
-    BSDL
+    LICENSE.txt
-    COPYING
     lib/pp.rb
     pp.gemspec
   ]