Test against 3.4.0-rc1

Author: soutaro

.github/workflows/ruby.yml

@@ -20,19 +20,19 @@ jobs:
         include:
           - ruby: head
             job: stdlib_test rubocop
-          - ruby: "3.3"
+          - ruby: "3.4.0-rc1"
             job: stdlib_test
-          - ruby: "3.3"
+          - ruby: "3.4.0-rc1"
             job: test
             rubyopt: "--enable-frozen-string-literal"
-          - ruby: "3.3"
+          - ruby: "3.4.0-rc1"
             job: stdlib_test
             rubyopt: "--enable-frozen-string-literal"
-          - ruby: "3.3"
+          - ruby: "3.4.0-rc1"
             job: lexer templates compile confirm_lexer confirm_templates
-          - ruby: "3.3"
+          - ruby: "3.4.0-rc1"
             job: rubocop validate test_doc build test_generate_stdlib raap
-          - ruby: "3.3"
+          - ruby: "3.4.0-rc1"
             job: typecheck_test
     env:
       RANDOMIZE_STDLIB_TEST_ORDER: "true"