CI test with Ruby 3.4.0-rc1

Prepare to release Ruby 3.4.0 soon.

Author: suketa

.github/workflows/test_on_macos.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         # ruby: ['3.1.6', '3.2.6', '3.3.6', '3.4.0-preview2', 'head']
-        ruby: ['3.1.6', '3.2.6', '3.3.6', '3.4.0-preview2']
+        ruby: ['3.1.6', '3.2.6', '3.3.6', '3.4.0-rc1']
         duckdb: ['1.1.3', '1.1.1', '1.0.0']
 
     steps:

.github/workflows/test_on_ubuntu.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: ['3.1.6', '3.2.6', '3.3.6', '3.4.0-preview2', 'head']
+        ruby: ['3.1.6', '3.2.6', '3.3.6', '3.4.0-rc1', 'head']
         duckdb: ['1.1.3', '1.1.1', '1.0.0']
 
     steps: