Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	ef4901b -> 2643798
index.docker.io/sourcegraph/frontend	digest	45bcd9c -> 3196da4
index.docker.io/sourcegraph/github-proxy	digest	c94526b -> 7f73f98
index.docker.io/sourcegraph/gitserver	digest	17afa20 -> 72d2df3
index.docker.io/sourcegraph/grafana	digest	2017216 -> bed89d9
index.docker.io/sourcegraph/jaeger-agent	digest	1a0c2cb -> 48d3c01
index.docker.io/sourcegraph/jaeger-all-in-one	digest	902f6c3 -> 249ad18
index.docker.io/sourcegraph/precise-code-intel-worker	digest	e8b2879 -> 6d7a32f
index.docker.io/sourcegraph/prometheus	digest	64a0d12 -> f0a7029
index.docker.io/sourcegraph/query-runner	digest	21cbfbd -> 2d513d7
index.docker.io/sourcegraph/repo-updater	digest	0f76cd6 -> ab08ced
index.docker.io/sourcegraph/searcher	digest	fc91e63 -> 48a3c29
index.docker.io/sourcegraph/symbols	digest	77f1975 -> ed3714a

Source: https://github.com/sourcegraph/sourcegraph/pull/17239

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