Update CI-used apple clang from 15 to 16.2

Author: clonker

Diff for: .circleci/config.yml

@@ -500,7 +500,7 @@ defaults:
 
   - base_osx: &base_osx
       macos:
-        xcode: "15.0.0"
+        xcode: "16.2.0"
       resource_class: macos.m1.medium.gen1
       environment: &base_osx_env
         TERM: xterm