[cd] Upgrade base-cipd

Upgrade to a base-cipd Docker image that fixes the PATH ordering
for gsutil that landed in http://review.skia.org/758490.

Bug: b/295525434
Change-Id: Ifc1d509c829d54a23d4e568ea46489c89fcc1e44
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/758818
Commit-Queue: Chris Mumford <cmumford@google.com>
Auto-Submit: Chris Mumford <cmumford@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 361e8f4..59078a0 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -336,7 +336,7 @@
 # skia_app_container macro.
 container_pull(
     name = "base-cipd",
-    digest = "sha256:43c9d07db9513219fdfcdd96b490172346e1c6ed33aa3f1ec288f7c830b41922",
+    digest = "sha256:d5c4239eac1efa961dd8d2cc8cb998a15aa4f4b59838b6c694839cfe032fbfe8",
     registry = "gcr.io",
     repository = "skia-public/base-cipd",
 )