fix(arbor): align with spack.target removal

packages/arbor/package.py

@@ -124,8 +124,8 @@ class Arbor(CMakePackage, CudaPackage):
 
         # query spack for the architecture-specific compiler flags set by its wrapper
         args.append("-DARB_ARCH=none")
-        opt_flags = self.spec.target.optimization_flags(
-            self.spec.compiler.name, self.spec.compiler.version
+        opt_flags = spack.build_environment.optimization_flags(
+            self.compiler, self.spec.target
         )
         args.append("-DARB_CXX_FLAGS_TARGET=" + opt_flags)