Update io.prometheus:* to v0.16.0

[solrbot]

This PR contains the following updates:

Package	Type	Update	Change
io.prometheus:simpleclient_httpserver	dependencies	minor	0.2.0 -> 0.16.0
io.prometheus:simpleclient_common	dependencies	minor	0.2.0 -> 0.16.0
io.prometheus:simpleclient	dependencies	minor	0.2.0 -> 0.16.0

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[janhoy]

This is used by prometheus-exporter. The two new jars are for providing trace exemplars for metrics. However, since prom-exporter runs in a separate JVM process from Solr, this won't work, so we exclude it instead. See https://github.com/prometheus/client_java/blob/main/OTEL_EXEMPLARS.md

[janhoy]

It's a bit confusing too that prometheus-exporter, which is a separate java app shares gradle build, and thus versions.props file with main Solr. Ideally the exporter should have its separate build?

[solrbot]

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