ci: use m4 host

we can start using this host again after clang has been downgraded to
20.x

Author: siddarthkay

ci/Jenkinsfile.macos

@@ -10,7 +10,7 @@ library '[email protected]'
 
 pipeline {
   /* This way we run the same Jenkinsfile on different platforms. */
-  agent { label 'macos && aarch64 && !macm4-01' }
+  agent { label 'macos && aarch64' }
 
   parameters {
     choice(