Add k8s 1.12.4 checksums (#3929)

roles/download/defaults/main.yml

@@ -72,6 +72,7 @@ cni_download_url: "https://github.com/containernetworking/plugins/releases/downl
 hyperkube_checksums:
   v1.13.1: f64c4328d3853f3e5680e7d296b0f3ed25e67ff98321867309edea100ebb4fd7
   v1.13.0: 754f1baae5dc2ba29afc66e1f5d3b676ee59cd5c40ccce813092408d53bde3d9
+  v1.12.4: a4697d8f3791f0408fcdb97b3de187e47d7b39a63332c75f68f95e25f4891cc9
   v1.12.3: 600aad3f0d016716abd85931239806193ffbe95f2edfdcea11532d518ae5cdb1
   v1.12.2: 566dfed398c20c9944f8999d6370cb584cb8c228b3c5881137b6b3d9306e4b06
   v1.12.1: 4aa23cfb2fc2e2e4d0cbe0d83a648c38e4baabd6c66f5cdbbb40cbc7582fdc74
@@ -94,6 +95,7 @@ hyperkube_checksums:
 kubeadm_checksums:
   v1.13.1: 438173bfa0b7014ecae994c5b9e1f27e1328ab971a3fdb06a393a8095a176ba0
   v1.13.0: f5366206416dc4cfc840a7add2289957b56ccc479cc1b74f7397a4df995d6b06
+  v1.12.4: 674ad5892ff2403f492c9042c3cea3fa0bfa3acf95bc7d1777c3645f0ddf64d7
   v1.12.3: c675aa3be82754b3f8dfdde2a1526a72986713312d46d898e65cb564c6aa8ad4
   v1.12.2: 51bc4bfd1d934a27245111c0ad1f793d5147ed15389415a1509502f23fcfa642
   v1.12.1: 5d95efd65aad398d85a9802799f36410ae7a95f9cbe73c8b10d2213c10a6d7be