Update Sourcegraph Docker insiders images

[sourcegraph-bot]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/cadvisor	digest	9868249 -> 641df3b
index.docker.io/sourcegraph/frontend	digest	5622407 -> f198ac5
index.docker.io/sourcegraph/github-proxy	digest	cde13d1 -> a04ac65
index.docker.io/sourcegraph/gitserver	digest	7b2f617 -> bdcda1e
index.docker.io/sourcegraph/grafana	digest	f15034d -> 1281d79
index.docker.io/sourcegraph/jaeger-agent	digest	69275cd -> 5e80969
index.docker.io/sourcegraph/jaeger-all-in-one	digest	4ba9e02 -> 1669c1b
index.docker.io/sourcegraph/precise-code-intel-worker	digest	c2fe32c -> 3f05f61
index.docker.io/sourcegraph/prometheus	digest	6a95988 -> c58a336
index.docker.io/sourcegraph/query-runner	digest	0559ef0 -> d8fd051
index.docker.io/sourcegraph/repo-updater	digest	48e978d -> 7bcfbdf
index.docker.io/sourcegraph/searcher	digest	e4fbb70 -> c976397
index.docker.io/sourcegraph/symbols	digest	4211095 -> 72c4d58

Source: https://github.com/sourcegraph/sourcegraph/pull/15778

---

Renovate configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻️ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

👻 Immortal: This PR will be recreated if closed unmerged. Get config help if that's undesired.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by the 'Renovate downstream' workflow