Bug 1415242 - Update host-utils manifest for osx hosts; r=me, a=test-only

testing/config/tooltool-manifests/macosx64/hostutils.manifest

@@ -1,10 +1,10 @@
 [
   {
-    "size": 121025970,
+    "size": 72112596,
     "visibility": "public",
-    "digest": "1374f461ad90fcdf1f6859df56379f000c7dbb0f8ea54c6652472c9e6f25052ec2386d00d6a41ed55579060e9300886674363f9689b1391e44518e500b9f2681",
+    "digest": "4d3fe61dd8ad9ca09c72e677e8d2d5b7409988de32d6feb9fc55cb0a320a4835b6e2f384a68d2409e89e7a0d2f622bf3ceb9b707e01ad8afe1270ad0d1c9973c",
     "algorithm": "sha512",
-    "filename": "host-utils-50.0a2.en-US.mac.tar.gz",
+    "filename": "host-utils-58.0a1.en-US.mac.tar.gz",
     "unpack": true
   }
 ]