Update GHA Python versions

3.15 line is currently pre-release, so use release candidate version.

Author: lieryan

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14', '3.15']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14', '3.15.0-rc.1']
         os: [ubuntu-latest, windows-latest, macos-latest]
       fail-fast: false
     steps: