[CI] Update environments

ubuntu-20.04 is dropped, macos-15 is available

Author: native-api

.github/workflows/tests.yml

@@ -6,8 +6,9 @@ jobs:
       fail-fast: false
       matrix:
         os:
+          - ubuntu-24.04
           - ubuntu-22.04
-          - ubuntu-20.04
+          - macos-15
           - macos-14
           - macos-13
     runs-on: ${{ matrix.os }}