Bump controller's required image versions

- nginx: 1.19.1
- google/cloud-sdk: 302.0.0-slim

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

config/controller.yaml

@@ -68,14 +68,14 @@ spec:
 
           # This image is used as a placeholder pod, the Affinity Assistant
           # TODO(#2640) We may want to create a custom, minimal binary
-          # As of June 8, 2020, tag 1.19.0
-          "-affinity-assistant-image", "nginx@sha256:c870bf53de0357813af37b9500cb1c2ff9fb4c00120d5fe1d75c21591293c34d",
+          # As of July 24, 2020, tag 1.19.1
+          "-affinity-assistant-image", "nginx@sha256:deb724a427ea79face617392a5a471fdcb4cdb57f971ee6b7e492b90fecb199f",
 
           # These images are pulled from Dockerhub, by digest, as of May 19, 2020.
           # As of May 29, 2020 new sha for nop image
           "-nop-image", "tianon/true@sha256:009cce421096698832595ce039aa13fa44327d96beedb84282a69d3dbcf5a81b",
-          # This is google/cloud-sdk:293.0.0-slim
-          "-gsutil-image", "google/cloud-sdk@sha256:37654ada9b7afbc32828b537030e85de672a9dd468ac5c92a36da1e203a98def",
+          # This is google/cloud-sdk:302.0.0-slim
+          "-gsutil-image", "google/cloud-sdk@sha256:27b2c22bf259d9bc1a291e99c63791ba0c27a04d2db0a43241ba0f1f20f4067f",
           # The shell image must be root in order to create directories and copy files to PVCs.
           # gcr.io/distroless/base:debug as of May 19, 2020
           "-shell-image", "gcr.io/distroless/base@sha256:f79e093f9ba639c957ee857b1ad57ae5046c328998bf8f72b30081db4d8edbe4",