Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	a0b6e70 -> 81968da
index.docker.io/sourcegraph/frontend	digest	ce10c0e -> 5fdca31
index.docker.io/sourcegraph/github-proxy	digest	6e43533 -> c3327cd
index.docker.io/sourcegraph/gitserver	digest	a6c375c -> 133040f
index.docker.io/sourcegraph/grafana	digest	675727a -> 8cc1915
index.docker.io/sourcegraph/jaeger-agent	digest	3c44b62 -> 9ce9f9d
index.docker.io/sourcegraph/jaeger-all-in-one	digest	b36a13c -> 6039ff9
index.docker.io/sourcegraph/precise-code-intel-worker	digest	598f8fa -> f943f1e
index.docker.io/sourcegraph/prometheus	digest	8a0a873 -> 98b4652
index.docker.io/sourcegraph/query-runner	digest	1682d78 -> d3eb3e1
index.docker.io/sourcegraph/repo-updater	digest	4377423 -> 6b12b08
index.docker.io/sourcegraph/searcher	digest	2cd86bb -> 9a65e6d
index.docker.io/sourcegraph/symbols	digest	ff47442 -> d218fd1

Source: https://github.com/sourcegraph/sourcegraph/pull/18263

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