Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	9e74d7a -> 0b78415
index.docker.io/sourcegraph/frontend	digest	aa4be01 -> e733ae4
index.docker.io/sourcegraph/github-proxy	digest	d40720d -> 515ce5c
index.docker.io/sourcegraph/gitserver	digest	63a37a4 -> 10e3548
index.docker.io/sourcegraph/grafana	digest	9373197 -> 09e817d
index.docker.io/sourcegraph/jaeger-agent	digest	02e93b8 -> db5b463
index.docker.io/sourcegraph/jaeger-all-in-one	digest	ebafbd0 -> 8da181e
index.docker.io/sourcegraph/precise-code-intel-worker	digest	509d7dc -> a7c92b8
index.docker.io/sourcegraph/prometheus	digest	6715749 -> 875da4f
index.docker.io/sourcegraph/query-runner	digest	b7aa5c2 -> bd4e8a8
index.docker.io/sourcegraph/repo-updater	digest	8d8691c -> 7295b4f
index.docker.io/sourcegraph/searcher	digest	9ed57fe -> 620db8c
index.docker.io/sourcegraph/symbols	digest	deb2f31 -> aba3a1f

Source: https://github.com/sourcegraph/sourcegraph/pull/18178

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