Update Sourcegraph Docker insiders images - autoclosed

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	7c6beeb -> dd1b772
index.docker.io/sourcegraph/frontend	digest	78c55ff -> 706413b
index.docker.io/sourcegraph/github-proxy	digest	b633c7d -> f726157
index.docker.io/sourcegraph/gitserver	digest	b38123d -> 91494ba
index.docker.io/sourcegraph/grafana	digest	4ae0c37 -> fc8ada1
index.docker.io/sourcegraph/jaeger-agent	digest	615767e -> dcdd502
index.docker.io/sourcegraph/jaeger-all-in-one	digest	acd54d5 -> d0fc86e
index.docker.io/sourcegraph/precise-code-intel-bundle-manager	digest	ead3e85 -> a5d881c
index.docker.io/sourcegraph/precise-code-intel-worker	digest	1f3a52f -> aae839c
index.docker.io/sourcegraph/prometheus	digest	f85cf33 -> fc316b6
index.docker.io/sourcegraph/query-runner	digest	72105ff -> 3491ec7
index.docker.io/sourcegraph/repo-updater	digest	d67f295 -> 13b1a37
index.docker.io/sourcegraph/searcher	digest	f57e354 -> d528610
index.docker.io/sourcegraph/symbols	digest	57a4234 -> b0eef0c

Source: sourcegraph/sourcegraph#13809

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