Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	bd2737e -> 327b247
index.docker.io/sourcegraph/frontend	digest	de51b38 -> 995edf4
index.docker.io/sourcegraph/github-proxy	digest	2247a2f -> e4c4126
index.docker.io/sourcegraph/gitserver	digest	a0d058b -> 838f506
index.docker.io/sourcegraph/grafana	digest	419b325 -> 31d3104
index.docker.io/sourcegraph/jaeger-agent	digest	92745b9 -> 7f22be6
index.docker.io/sourcegraph/jaeger-all-in-one	digest	25e34e5 -> 914785f
index.docker.io/sourcegraph/precise-code-intel-worker	digest	eb57f05 -> f22a3ff
index.docker.io/sourcegraph/prometheus	digest	f0ce929 -> ac6b667
index.docker.io/sourcegraph/query-runner	digest	9247dce -> abb661e
index.docker.io/sourcegraph/repo-updater	digest	cb7182f -> 04ab321
index.docker.io/sourcegraph/searcher	digest	59418e2 -> bf93849
index.docker.io/sourcegraph/symbols	digest	b2cfc78 -> 9c7d4bc

Source: https://github.com/sourcegraph/sourcegraph/pull/18166

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