Update dependency kubernetes/kubernetes to v1.18.20

hardening_manifest.yaml

@@ -8,7 +8,7 @@ name: "opensource/kubernetes-1.18/kube-scheduler-1.18"
 # The most specific version should be the first tag and will be shown
 # on ironbank.dsop.io
 tags:
-- "v1.18.19"
+- "v1.18.20"
 - "latest"
 
 # Build args passed to Dockerfile ARGs
@@ -27,7 +27,7 @@ labels:
   org.opencontainers.image.url: "https://kubernetes.io/"
   ## Name of the distributing entity, organization or individual
   org.opencontainers.image.vendor: "opensource"
-  org.opencontainers.image.version: "v1.18.19"
+  org.opencontainers.image.version: "v1.18.20"
   ## Keywords to help with search (ex. "cicd,gitops,golang")
   mil.dso.ironbank.image.keywords: "kubernetes"
   ## This value can be "opensource" or "commercial"
@@ -37,11 +37,11 @@ labels:
 
 # List of resources to make available to the offline build context
 resources:
-- url: https://github.com/kubernetes/kubernetes/archive/refs/tags/v1.18.19.tar.gz
+- url: https://github.com/kubernetes/kubernetes/archive/refs/tags/v1.18.20.tar.gz
   filename: kubernetes.tar.gz
   validation:
     type: sha256
-    value: 2812e4c0b66fe5efe588c6affdb6c0e180e8649dadacb5144511feb398f2001e
+    value: 45bcf77fb5beb52aa2ecb22594193938cecf033b1e9409ad1cd0f7af15f32e3b
 
 # List of project maintainers
 maintainers: