Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	092026d -> 60a5815
index.docker.io/sourcegraph/frontend	digest	44c933f -> 8d301ed
index.docker.io/sourcegraph/github-proxy	digest	656fc5a -> 86a874f
index.docker.io/sourcegraph/gitserver	digest	bed2dc4 -> 7eb1d5f
index.docker.io/sourcegraph/grafana	digest	fcf53b1 -> a29249d
index.docker.io/sourcegraph/jaeger-agent	digest	9a3ce7d -> 0c07543
index.docker.io/sourcegraph/jaeger-all-in-one	digest	334b71d -> f34ab2a
index.docker.io/sourcegraph/precise-code-intel-worker	digest	36e7d32 -> 1b1c746
index.docker.io/sourcegraph/prometheus	digest	53f46d7 -> d92e3c9
index.docker.io/sourcegraph/query-runner	digest	676b6a6 -> 699029a
index.docker.io/sourcegraph/repo-updater	digest	90f0472 -> 9d6f30d
index.docker.io/sourcegraph/searcher	digest	bf6943e -> 576864e
index.docker.io/sourcegraph/symbols	digest	149099c -> 3ade521

Source: https://github.com/sourcegraph/sourcegraph/pull/17654

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