Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	e1c6b23 -> 883775c
index.docker.io/sourcegraph/frontend	digest	804fab6 -> 42dd026
index.docker.io/sourcegraph/github-proxy	digest	071ccb6 -> 05f772d
index.docker.io/sourcegraph/gitserver	digest	eeb5b93 -> 6523a6e
index.docker.io/sourcegraph/grafana	digest	1218552 -> 5f2195c
index.docker.io/sourcegraph/jaeger-agent	digest	8b7b6cf -> 7721ea6
index.docker.io/sourcegraph/jaeger-all-in-one	digest	1ee6531 -> 3989deb
index.docker.io/sourcegraph/precise-code-intel-worker	digest	a90bba0 -> 86efa6c
index.docker.io/sourcegraph/prometheus	digest	e7f361f -> 6740414
index.docker.io/sourcegraph/query-runner	digest	94a49c6 -> 9050f53
index.docker.io/sourcegraph/repo-updater	digest	5e8ace0 -> 41537b7
index.docker.io/sourcegraph/searcher	digest	3ca68bb -> bae8838
index.docker.io/sourcegraph/symbols	digest	3b63aff -> 86858be

Source: sourcegraph/sourcegraph#15258

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