third_party: bump Kubernetes to 1.19.7

This... didn't exactly go well. Turns out a change between rc.1 and rc.2
broke our runc runtime by enabling seccomp by default for pod sandboxes.

We work around this by reverting this change, and filing T916 to solve
this soon.

This fixes T910 and T909.

Test Plan: kube bump, CI should run e2e, didn't run CTS.

Bug: T910, T909

X-Origin-Diff: phab/D691
GitOrigin-RevId: 78afca77c294895859e0af9150128d82677d875b
diff --git a/build/print-workspace-status.sh b/build/print-workspace-status.sh
index 57138a4..291c8e8 100755
--- a/build/print-workspace-status.sh
+++ b/build/print-workspace-status.sh
@@ -16,7 +16,7 @@
 # TODO(q3k): unify with //third_party/go/repsitories.bzl.
 KUBERNETES_gitMajor="1"
 KUBERNETES_gitMinor="19"
-KUBERNETES_gitVersion="v1.19.0-rc.0+nxt"
+KUBERNETES_gitVersion="v1.19.7+mngn"
 
 cat <<EOF
 KUBERNETES_gitCommit $(git rev-parse "HEAD^{commit}")