Revert "cmd/worker: upgrade runsc to latest release"

This reverts commit 5dd36c2b64b6eed703112bb9eb8d9b89fd289bae.

Reason for revert: We are seeing a lot of errors now where docker is not able to create new OS threads. This was the only change introduced. Reverting for now.

Change-Id: Ia6b975ae295c7a8f1153679d65f210b9a4e7186e
Reviewed-on: https://go-review.googlesource.com/c/pkgsite-metrics/+/544575
Run-TryBot: Zvonimir Pavlinovic <zpavlinovic@google.com>
Reviewed-by: Maceo Thompson <maceothompson@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Zvonimir Pavlinovic <zpavlinovic@google.com>
diff --git a/cmd/worker/Dockerfile b/cmd/worker/Dockerfile
index 64a0625..4cf6497 100644
--- a/cmd/worker/Dockerfile
+++ b/cmd/worker/Dockerfile
@@ -42,7 +42,7 @@
 #### Sandbox setup
 
 # Install runsc.
-ADD https://storage.googleapis.com/gvisor/releases/release/20231113.0/x86_64/runsc /usr/local/bin/
+ADD https://storage.googleapis.com/gvisor/releases/release/20230320.0/x86_64/runsc /usr/local/bin/
 RUN chmod a+rx /usr/local/bin/runsc
 
 # Set up for runsc.