justinsb: Update AMIs in alpha channels

JobBuild
fcb26fb7
08-16 14:44
pull-kops-bazel-build 1162448159717199873 1162374420535185408
pull-kops-bazel-test 1162448159717199874 1162374420530991105
pull-kops-e2e-kubernetes-aws 1162448159717199875 1162418461708652544 1162374420530991109
pull-kops-verify-bazel 1162448159717199878 1162374420530991107
pull-kops-verify-boilerplate 1162448159713005568 1162374420530991110
pull-kops-verify-gofmt 1162448159717199872 1162374420530991106
pull-kops-verify-govet 1162448159717199876 1162374420535185409
pull-kops-verify-packages 1162448159717199877 1162374420530991108