Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	fb04e9a -> 964e009
index.docker.io/sourcegraph/frontend	digest	b1a108c -> 16b0e89
index.docker.io/sourcegraph/github-proxy	digest	86c40f3 -> 3e9c7c2
index.docker.io/sourcegraph/gitserver	digest	f4f4717 -> cf67868
index.docker.io/sourcegraph/grafana	digest	8bc6aaf -> d4847e2
index.docker.io/sourcegraph/jaeger-agent	digest	2a7d719 -> 5066517
index.docker.io/sourcegraph/jaeger-all-in-one	digest	ccc958b -> dea6b27
index.docker.io/sourcegraph/precise-code-intel-worker	digest	049b2f7 -> cfc8b32
index.docker.io/sourcegraph/prometheus	digest	094ef1b -> bae8d0b
index.docker.io/sourcegraph/query-runner	digest	28165f3 -> 01bd4d9
index.docker.io/sourcegraph/repo-updater	digest	2a5318d -> 36859cc
index.docker.io/sourcegraph/searcher	digest	6e4eee9 -> 3fb1fdc
index.docker.io/sourcegraph/symbols	digest	c648290 -> 6e257e9

Source: https://github.com/sourcegraph/sourcegraph/pull/18358

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