Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	120c6ba -> 6531e34
index.docker.io/sourcegraph/frontend	digest	6e93306 -> 5713e4f
index.docker.io/sourcegraph/github-proxy	digest	62f6c17 -> dc46e43
index.docker.io/sourcegraph/gitserver	digest	eb6d869 -> df6f9ac
index.docker.io/sourcegraph/grafana	digest	691c210 -> 2701521
index.docker.io/sourcegraph/jaeger-agent	digest	3675bb7 -> f990116
index.docker.io/sourcegraph/jaeger-all-in-one	digest	de57b41 -> 2105b63
index.docker.io/sourcegraph/precise-code-intel-worker	digest	3df5fdf -> 23f8ec2
index.docker.io/sourcegraph/prometheus	digest	1ed9d83 -> 2301ab2
index.docker.io/sourcegraph/query-runner	digest	8410b2c -> fe0b6a9
index.docker.io/sourcegraph/repo-updater	digest	5b758d1 -> 3b73246
index.docker.io/sourcegraph/searcher	digest	2315e26 -> c5d8ae4
index.docker.io/sourcegraph/symbols	digest	b722322 -> 2706487

Source: https://github.com/sourcegraph/sourcegraph/pull/16937

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