Update XCode version for dist-apple-various to match other runners

Author: shepmaster

src/ci/github-actions/jobs.yml

@@ -446,7 +446,8 @@ auto:
       # FIXME(madsmtm): This might be redundant, as we're not building host tooling here (?)
       MACOSX_DEPLOYMENT_TARGET: 10.12
       MACOSX_STD_DEPLOYMENT_TARGET: 10.12
-      SELECT_XCODE: /Applications/Xcode_15.2.app
+      SELECT_XCODE: /Applications/Xcode_15.4.app
+      USE_XCODE_CLANG: 1
     <<: *job-macos
 
   - name: dist-aarch64-apple