Roll debugger-app-base from 4711d822d730 to 21501cfbf475

If this roll has caused a breakage, revert this CL and set the roller
to dry run mode using the controls here:
https://autoroll.skia.org/r/debugger-app-base-skia
Please CC borenet@google.com,skiabot@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Skia: https://bugs.chromium.org/p/skia/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Tbr: borenet@google.com
Change-Id: I33b759c359ef403e2634bc3b93572008621e43c5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1398019
Bot-Commit: skia-autoroll@skia-public.iam.gserviceaccount.com <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll@skia-public.iam.gserviceaccount.com <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/infra/debugger-app/Dockerfile b/infra/debugger-app/Dockerfile
index b90886b..60d33d8 100644
--- a/infra/debugger-app/Dockerfile
+++ b/infra/debugger-app/Dockerfile
@@ -1,4 +1,4 @@
-FROM gcr.io/skia-public/debugger-app-base@sha256:4711d822d73011137f3ec66f9857c084da6a2506378fb56ae9fd631c1247fb7b
+FROM gcr.io/skia-public/debugger-app-base@sha256:21501cfbf4757db0ef0f2e82f59aae37228c97e9dcbd5c6fc28c010d12fd35fb
 
 COPY canvaskit.js /usr/local/share/debugger-app/canvaskit.js
 COPY canvaskit.wasm /usr/local/share/debugger-app/canvaskit.wasm