Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	1d17eb6 -> 0540122
index.docker.io/sourcegraph/frontend	digest	b42f2f6 -> 1502061
index.docker.io/sourcegraph/github-proxy	digest	5084c69 -> e84f3ba
index.docker.io/sourcegraph/gitserver	digest	9801046 -> 8322185
index.docker.io/sourcegraph/grafana	digest	58fa9ce -> ae7b81c
index.docker.io/sourcegraph/jaeger-agent	digest	e1faae2 -> 8547ce6
index.docker.io/sourcegraph/jaeger-all-in-one	digest	761cd1d -> 3c0f572
index.docker.io/sourcegraph/precise-code-intel-worker	digest	e72ba33 -> 1ff7d67
index.docker.io/sourcegraph/prometheus	digest	14fe712 -> 843a003
index.docker.io/sourcegraph/query-runner	digest	238786d -> 606cfbd
index.docker.io/sourcegraph/repo-updater	digest	186bf9b -> 9b413ba
index.docker.io/sourcegraph/searcher	digest	7bc01b0 -> 8dbc183
index.docker.io/sourcegraph/symbols	digest	dd68041 -> 0eea233

Source: https://github.com/sourcegraph/sourcegraph/pull/17701

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