Update the RBE toolchain and puppeteer-tests container images.

The purpose of this CL is to ensure that both container images have the same version of Chrome, fonts, etc. This will prevent diffs in Puppeteer screenshots produced from Bazel vs. Webpack due to environment differences.

Bug: skia:10614
Change-Id: Ia4d9a70085be7fb273fe586cd2c2f24821f27f44
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/393796
Reviewed-by: Leandro Lovisolo <lovisolo@google.com>
Commit-Queue: Leandro Lovisolo <lovisolo@google.com>
diff --git a/Makefile b/Makefile
index 2ccedfe..be73cba 100644
--- a/Makefile
+++ b/Makefile
@@ -79,7 +79,7 @@
 	go build ./...
 
 # Docker image used to run Puppeteer tests (Webpack build).
-PUPPETEER_TESTS_DOCKER_IMG=gcr.io/skia-public/puppeteer-tests@sha256:5225ceb3e9a3a22c2e2bc9d23c333a2e2d815ee3ee00d32227013a6a697d55e9
+PUPPETEER_TESTS_DOCKER_IMG=gcr.io/skia-public/puppeteer-tests:2021-04-08T03_04_24Z-lovisolo-5773877-dirty
 
 # This is invoked from Infra-PerCommit-Puppeteer.
 .PHONY: puppeteer-tests
diff --git a/WORKSPACE b/WORKSPACE
index 92e42ec..6c2d566 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -222,7 +222,7 @@
     #
     # Must be updated manually after a new container image is uploaded to the container registry
     # via "bazel run //:push_rbe_container_skia_infra".
-    digest = "sha256:78c203c69ccc6e2f78cd389b64d5302dd6b224f13c4fcb176bc9a16fb3c37910",
+    digest = "sha256:6a3760d431573e9c5d9caee2b20509e5f4e4670868c1024772ffd695f9bcda27",
     # Enable networking. Without this, tests that require network access will fail. Examples include
     # go_test targets that try to clone the Skia Git repo from https://skia.googlesource.com/skia,
     # tests that hit GCS, etc.