Fix linting issues - trailing whitespace and newlines

Co-authored-by: GrantBirki <[email protected]>

Author: Copilot

spec/integration/header_symbolization_spec.rb

@@ -71,4 +71,4 @@
       expect(symbolized_headers).to eq(headers)
     end
   end
-end
+end

spec/unit/lib/hooks/core/config_loader_spec.rb

@@ -375,9 +375,9 @@
       end
       it "allows opt-out via environment variable" do
         ENV["HOOKS_SYMBOLIZE_HEADERS"] = "false"
-        
+
         config = described_class.load
-        
+
         expect(config[:symbolize_headers]).to be false
       end
     end