Set RSpec/DescribedClass cop to explicit

Additionally:
- Autofix offenses
- Update RuboCop dependencies and set require to false
- Regenerate rubocop_todo.yml

Ref: #177 (comment)

.rubocop.yml

@@ -15,3 +15,7 @@ AllCops:
 # https://github.com/jamesmartin/inline_svg/pull/171/files#r1798763446
 Style/EachWithObject:
   Enabled: false
+
+# https://github.com/jamesmartin/inline_svg/pull/177#issuecomment-2530239552
+RSpec/DescribedClass:
+  EnforcedStyle: explicit

Gemfile

@@ -10,8 +10,8 @@ gem "pry"
 gem "rake"
 gem "rspec"
 
-gem "rubocop", "1.66.1"
-gem "rubocop-packaging", "0.5.2"
-gem "rubocop-performance", "1.22.1"
-gem "rubocop-rake", "0.6.0"
-gem "rubocop-rspec", "3.0.5"
+gem "rubocop", "1.69.2", require: false
+gem "rubocop-packaging", "0.5.2", require: false
+gem "rubocop-performance", "1.23.0", require: false
+gem "rubocop-rake", "0.6.0", require: false
+gem "rubocop-rspec", "3.3.0", require: false

spec/static_asset_finder_spec.rb

@@ -8,7 +8,7 @@
       stub_const('Rails', double('Rails').as_null_object)
       expect(Rails.application.config.assets).to receive(:compile).and_return(true)
 
-      expect(described_class.find_asset('some-file').pathname).to be_nil
+      expect(InlineSvg::StaticAssetFinder.find_asset('some-file').pathname).to be_nil
     end
   end
 
@@ -21,7 +21,7 @@
       expect(asset).to receive(:filename).and_return(pathname)
       expect(Rails.application.assets).to receive(:[]).with('some-file').and_return(asset)
 
-      expect(described_class.find_asset('some-file').pathname).to eq(pathname)
+      expect(InlineSvg::StaticAssetFinder.find_asset('some-file').pathname).to eq(pathname)
     end
   end
 end

spec/webpack_asset_finder_spec.rb

@@ -9,7 +9,7 @@
       stub_const('Shakapacker', double('Shakapacker').as_null_object)
       expect(Shakapacker.manifest).to receive(:lookup).with('some-file').and_return(nil)
 
-      expect(described_class.find_asset('some-file').pathname).to be_nil
+      expect(InlineSvg::WebpackAssetFinder.find_asset('some-file').pathname).to be_nil
     end
   end
 end