fix(deps): update dependency io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom-alpha to v2.31.0-alpha

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom-alpha	2.30.0-alpha → 2.31.0-alpha

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Benchmark results

Benchmark run finished with conclusion skipped for eb6085726488795030049f8a8c6cc0a2d29d778b.

• Workflow run: https://github.com/prometheus/client_java/actions/runs/32426159187
• Artifact: pr-benchmark-results-pr-2401-eb6085726488795030049f8a8c6cc0a2d29d778b

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

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Benchmark results

Benchmark run finished with conclusion skipped for eb6085726488795030049f8a8c6cc0a2d29d778b.

• Workflow run: https://github.com/prometheus/client_java/actions/runs/32426159142
• Artifact: pr-benchmark-results-pr-2401-eb6085726488795030049f8a8c6cc0a2d29d778b

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