fix(deps): update jetty monorepo to v12.1.11

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.eclipse.jetty.ee10:jetty-ee10-servlet (source)	12.1.10 → 12.1.11
org.eclipse.jetty:jetty-server (source)	12.1.10 → 12.1.11

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Benchmark results

Benchmark run finished with conclusion skipped for c8b838d78d79a98dc76580dfcc13b8a19d118430.

• Workflow run: https://github.com/prometheus/client_java/actions/runs/28894786823
• Artifact: pr-benchmark-results-pr-2279-c8b838d78d79a98dc76580dfcc13b8a19d118430

Benchmark summary artifact was not found; see the workflow run for details.