Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	7c13b39 -> 1df4e42
index.docker.io/sourcegraph/frontend	digest	033a491 -> e43ded7
index.docker.io/sourcegraph/github-proxy	digest	843521d -> a45bc55
index.docker.io/sourcegraph/gitserver	digest	000a078 -> 67b800a
index.docker.io/sourcegraph/grafana	digest	cd76044 -> a7f1ec7
index.docker.io/sourcegraph/jaeger-agent	digest	a13aa63 -> 2499b7c
index.docker.io/sourcegraph/jaeger-all-in-one	digest	87bac4e -> 01d8b5d
index.docker.io/sourcegraph/precise-code-intel-worker	digest	e17fd9e -> 1f2e492
index.docker.io/sourcegraph/prometheus	digest	9137e69 -> 2f8ba3f
index.docker.io/sourcegraph/query-runner	digest	1d86ead -> 3d8076e
index.docker.io/sourcegraph/repo-updater	digest	92efaed -> 4bbe1ce
index.docker.io/sourcegraph/searcher	digest	560df6d -> 7774a37
index.docker.io/sourcegraph/symbols	digest	fda6037 -> 1ed8e70

Source: sourcegraph/sourcegraph#16199

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