Merge pull request #290 from nzw0301/lightgbm-py-312

Add python 3.12 to lightgbm CI

Author: nabenabe0928

.github/workflows/lightgbm.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
 
     steps:
     - uses: actions/checkout@v4