fix clang ubuntu 22.04 https://github.com/actions/partner-runner-images/blob/main/images/arm-ubuntu-22-image.md

Author: johnnynunez

.github/workflows/tests.yml

@@ -134,7 +134,7 @@ jobs:
           - os: ubuntu-22.04-arm
             arch: aarch64
             compiler: clang++
-            clang-version: 16
+            clang-version: 15
             python-version: "3.13"
             castxml-epic: 0
             cppstd: "-std=c++17"