[bazel] Update RBE toolchain container image.

Follow-up to https://skia-review.googlesource.com/c/buildbot/+/401926. After this CL lands, the Android NDK will be available on the RBE environment at /usr/local/android-ndk-r21e.

Change-Id: I35b9b4d5857054aea796b9681c3747b91bb8ba42
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/402316
Commit-Queue: Joe Gregorio <jcgregorio@google.com>
Auto-Submit: Leandro Lovisolo <lovisolo@google.com>
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
diff --git a/WORKSPACE b/WORKSPACE
index 4506ed5..aef2a5c 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 = "sha256:6a3760d431573e9c5d9caee2b20509e5f4e4670868c1024772ffd695f9bcda27",
+    digest = "sha256:341955ba1146b2e117cc858994d123d4bd8f528889b59793a3a8700fcf2fda17",
     # 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.