Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	1330702 -> dec18c9
index.docker.io/sourcegraph/frontend	digest	8545144 -> 5c4e54a
index.docker.io/sourcegraph/github-proxy	digest	296e9e1 -> 12312d6
index.docker.io/sourcegraph/gitserver	digest	c926804 -> 0c3a8be
index.docker.io/sourcegraph/grafana	digest	974e7b5 -> ceb886e
index.docker.io/sourcegraph/jaeger-agent	digest	2681828 -> 6825c81
index.docker.io/sourcegraph/jaeger-all-in-one	digest	324dc15 -> 74d0b48
index.docker.io/sourcegraph/precise-code-intel-worker	digest	a7058cb -> f5c8cb0
index.docker.io/sourcegraph/prometheus	digest	1274bf7 -> 35650e2
index.docker.io/sourcegraph/query-runner	digest	8a81364 -> f412515
index.docker.io/sourcegraph/repo-updater	digest	3b73b4d -> f6c41b6
index.docker.io/sourcegraph/searcher	digest	6021ade -> 2be7b1e
index.docker.io/sourcegraph/symbols	digest	7934832 -> cafd6a0

Source: https://github.com/sourcegraph/sourcegraph/pull/18174

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