cluster/certs: update k0 certs

This leaves us with the next set of expiring certs in September 2021.

Fixes b/36.

Change-Id: I536497626c0dd3807fccf28d4b61e5e531cf8d9c
diff --git a/cluster/certs/kube-proxy.cert b/cluster/certs/kube-proxy.cert
index c638345..11790c0 100644
--- a/cluster/certs/kube-proxy.cert
+++ b/cluster/certs/kube-proxy.cert
@@ -1,9 +1,9 @@
 -----BEGIN CERTIFICATE-----
-MIIFQzCCBCugAwIBAgIUNOcUBxeoeF2k8lsdrL+mqCe0O7swDQYJKoZIhvcNAQEL
+MIIFQzCCBCugAwIBAgIUAaW3eAYNLLYjQqg45/6XqRwBMGIwDQYJKoZIhvcNAQEL
 BQAwgYMxCzAJBgNVBAYTAlBMMRQwEgYDVQQIEwtNYXpvd2llY2tpZTEPMA0GA1UE
 BxMGV2Fyc2F3MRswGQYDVQQKExJXYXJzYXcgSGFja2Vyc3BhY2UxEzARBgNVBAsT
-CmNsdXN0ZXJjZmcxGzAZBgNVBAMTEmt1YmVybmV0ZXMgbWFpbiBDQTAeFw0yMDAz
-MjgxNTE1MDBaFw0yMTAzMjgxNTE1MDBaMIGRMQswCQYDVQQGEwJQTDEUMBIGA1UE
+CmNsdXN0ZXJjZmcxGzAZBgNVBAMTEmt1YmVybmV0ZXMgbWFpbiBDQTAeFw0yMTAz
+MjcxMTI3MDBaFw0yMjAzMjcxMTI3MDBaMIGRMQswCQYDVQQGEwJQTDEUMBIGA1UE
 CBMLTWF6b3dpZWNraWUxDzANBgNVBAcTBldhcnNhdzEaMBgGA1UEChMRc3lzdGVt
 Omt1YmUtcHJveHkxIzAhBgNVBAsTGkt1YmVybmV0ZXMgQ29tcG9uZW50IHByb3h5
 MRowGAYDVQQDExFzeXN0ZW06a3ViZS1wcm94eTCCAiIwDQYJKoZIhvcNAQEBBQAD
@@ -21,11 +21,11 @@
 AAGjgZ4wgZswDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggr
 BgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBTn0MVsvuVE2ZiSJNZfEp6Q
 pb8u9jAfBgNVHSMEGDAWgBSYMl0OTzMe+wnpiSQTFkJqgNGZ0DAcBgNVHREEFTAT
-hhFzeXN0ZW06a3ViZS1wcm94eTANBgkqhkiG9w0BAQsFAAOCAQEAa+LkfAbWHUSs
-19veJ09P0uo6PYKqXsOrh9soWX8lusI3Zt3zhTdSXkzJwKi8bH3zFx8niWAIHNwZ
-mxesvJIH6fPA0/401MkjhSRo3cyMUnjKmjx5+DD2qIEKKBPsr/xNMpJGPKaDjGtk
-YyRHW8Bg7kX+Jc/uv7Gg6U+/xtdbELaxL/USufRN7obC7gNtenXkdOUgINrfllX/
-66+K7yqaAqaCR4gEGSLUnUvkbFZ/+XB7Z1tLKgWurJj5v82ZxnkBI+aU3tVwLtoT
-tnH7OLi5Tbo+RYuf3iMd1vGxVwEPcD9cBUz0lRsK9TTJxRytS8CnS3EIwcitYo86
-+yl7LltiSA==
+hhFzeXN0ZW06a3ViZS1wcm94eTANBgkqhkiG9w0BAQsFAAOCAQEAk1cL0SzdLP2E
+KhV6VNpjGT1/V1u31V6SXueucesstPubEFDUrlGeDeaww8dJXBx694jpGKXBvD/F
+kskLsOTABlK2h/CuXHoWImSZxUmTHOEZLB1u1coAUfy/C1pegg1OklW3judbbQQM
+4mArJh+JNXR6SW3J9Q9HKmgBUV2O5C8PuxMyB51zWkA2ZMLIXtNv4OSjrVRoyc57
+URopH5ZBucq+T+GzmEQB4Xgs39fpvWX+6rqB49TcfF3jqTVGJD38nkVUnfj06Tl6
+VGN2GZiec5/dmVKCqdqFefezQVXjEooA4TwXr+l4xtQECTMapSHBPdHnFavY5PDY
+G53Txq4iBA==
 -----END CERTIFICATE-----