Update sha256 for prometheus/busybox-linux
Created by: jhchabran
Build failure: https://buildkite.com/sourcegraph/sourcegraph/builds/121041#1b720706-b1b5-46ea-9ea7-c8d1cca99756/66-139
failed to solve with frontend dockerfile.v0: failed to create LLB definition: quay.io/prometheus/busybox-linux-amd64:latest@sha256:97a9aacc097e5dbdec33b0d671adea0785e76d26ff2b979ee28570baf6a9155d: not found
Root cause: https://github.com/prometheus/busybox/pull/45, the image is now built on a monthly basis, which will cause this to happen again.
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Ping the owning team on Slack to notify them about this.