Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	0735fd7 -> 961654a
index.docker.io/sourcegraph/frontend	digest	1d9cd45 -> 7270b8c
index.docker.io/sourcegraph/github-proxy	digest	8b70c0a -> 96af897
index.docker.io/sourcegraph/gitserver	digest	026602c -> 11f65ef
index.docker.io/sourcegraph/grafana	digest	6d529b4 -> fb2ee25
index.docker.io/sourcegraph/jaeger-agent	digest	e0a9efc -> 3d26094
index.docker.io/sourcegraph/jaeger-all-in-one	digest	c9d587b -> a582e5e
index.docker.io/sourcegraph/precise-code-intel-worker	digest	920f027 -> 78dc350
index.docker.io/sourcegraph/prometheus	digest	5b2b6ea -> 583b592
index.docker.io/sourcegraph/query-runner	digest	eedfad3 -> be74245
index.docker.io/sourcegraph/repo-updater	digest	dad9027 -> 2421d62
index.docker.io/sourcegraph/searcher	digest	0d2f6a3 -> e30b4cc
index.docker.io/sourcegraph/symbols	digest	8301391 -> d51636f

Source: https://github.com/sourcegraph/sourcegraph/pull/17735

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