ci: fix ruby 3.4 compatibility failures

Author: ihabadham

spec/react_on_rails/prender_error_spec.rb

@@ -65,9 +65,13 @@ module ReactOnRails
         it "shows truncated backtrace with notice" do
           message = expected_error.message
           expect(message).to include(err.inspect)
-          expect(message).to include(
-            "spec/react_on_rails/prender_error_spec.rb:20:in `block (2 levels) in <module:ReactOnRails>'"
-          )
+
+          # Ruby 3.4 includes class/module names in backtrace method names, but core pattern remains
+          # Ruby 3.3: "spec/react_on_rails/prender_error_spec.rb:20:in `block (2 levels) in <module:ReactOnRails>'"
+          # Ruby 3.4: "spec/react_on_rails/prender_error_spec.rb:20:in `SomeClass#block (2 levels) in <module:ReactOnRails>'"
+          expect(message).to include("spec/react_on_rails/prender_error_spec.rb:20")
+          expect(message).to include("block (2 levels) in <module:ReactOnRails>")
+
           expect(message).to include("The rest of the backtrace is hidden")
         end
       end

spec/react_on_rails/utils_spec.rb

@@ -463,9 +463,16 @@ def mock_dev_server_running
 
           it "trims handles a hash" do
             s = { a: "1234567890" }
-            expect(described_class.smart_trim(s, 9)).to eq(
-              "{:a=#{Utils::TRUNCATION_FILLER}890\"}"
-            )
+            result = described_class.smart_trim(s, 9)
+
+            # Ruby 3.4+ uses modern hash syntax: {a: "value"}
+            # Ruby 3.3 uses old syntax: {:a=>"value"}
+            expected_modern = "{a: #{Utils::TRUNCATION_FILLER}890\"}"
+            expected_legacy = "{:a=#{Utils::TRUNCATION_FILLER}890\"}"
+
+            expect(result).to satisfy("match either Ruby 3.3 or 3.4+ hash format") do |value|
+              value == expected_modern || value == expected_legacy
+            end
           end
         end
       end