chore(deps): update sourcegraph docker images to v6.6.0

[renovate]

This PR contains the following updates:

Package	Update	Change
index.docker.io/sourcegraph/blobstore (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/caddy (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/cadvisor (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/frontend (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/gitserver (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/indexed-searcher (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/jaeger-all-in-one (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/migrator (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/node-exporter (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/opentelemetry-collector (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/postgres_exporter (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/postgresql-16 (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/postgresql-16-codeinsights (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/precise-code-intel-worker (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/redis-cache (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/redis-store (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/search-indexer (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/searcher (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/syntactic-code-intel-worker (source)	minor	6.1.1295 -> 6.6.0
index.docker.io/sourcegraph/syntax-highlighter (source)	minor	6.1.2889 -> 6.6.0
index.docker.io/sourcegraph/worker (source)	minor	6.1.2889 -> 6.6.0

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