Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	e8cd40c -> 2f7546c
index.docker.io/sourcegraph/frontend	digest	b06db2a -> 5e6991c
index.docker.io/sourcegraph/github-proxy	digest	efc4130 -> 4102e34
index.docker.io/sourcegraph/gitserver	digest	ff9ea36 -> 56c79cb
index.docker.io/sourcegraph/grafana	digest	eb29b85 -> 7bdf5e2
index.docker.io/sourcegraph/jaeger-agent	digest	f12f88c -> c7f599f
index.docker.io/sourcegraph/jaeger-all-in-one	digest	dad1b92 -> b715ef7
index.docker.io/sourcegraph/precise-code-intel-worker	digest	9a14d56 -> f5d5564
index.docker.io/sourcegraph/prometheus	digest	27f118a -> 8cc8497
index.docker.io/sourcegraph/query-runner	digest	203207b -> 446dc65
index.docker.io/sourcegraph/repo-updater	digest	dbd26a4 -> 72a0c98
index.docker.io/sourcegraph/searcher	digest	41b83a5 -> a709fa9
index.docker.io/sourcegraph/symbols	digest	c441717 -> e64557a

Source: https://github.com/sourcegraph/sourcegraph/pull/18132

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