chore(deps): update opentelemetry to 1.15.0

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
OpenTelemetry.Exporter.OpenTelemetryProtocol (source)	nuget	minor	1.14.0 → 1.15.0
OpenTelemetry.Extensions.Hosting (source)	nuget	minor	1.14.0 → 1.15.0

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Release Notes

open-telemetry/opentelemetry-dotnet (OpenTelemetry.Exporter.OpenTelemetryProtocol)

v1.15.0

Release details: 1.15.0

• Added support for ActivitySource.TelemetrySchemaUrl
  and Meter.TelemetrySchemaUrl properties across exporters.
• Improved performance and reduced memory consumption for metrics histograms.
• Added mTLS configuration support for the OTLP exporter (client cert/key and
  CA certificate options).
• OpenTelemetry.Exporter.Zipkin is deprecated and will stop receiving updates
  in December 2026. Zipkin already supports OTLP ingestion.
  Migrate to OpenTelemetry.Exporter.OpenTelemetryProtocol as stated
  in the Deprecating Zipkin Exporter blog post.

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Configuration

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This PR has been generated by Renovate Bot.

[thomhurst]

Summary

Updates OpenTelemetry packages from 1.14.0 to 1.15.0 in the Aspire starter template.

Critical Issues

None found ✅

This is a minor version dependency update in a template project that doesn't touch any TUnit core functionality, source generators, or public APIs. The OpenTelemetry 1.15.0 release adds new features (schema URL support, mTLS configuration) and performance improvements for metrics histograms, all of which are backward compatible additions.

Verdict

✅ APPROVE - No critical issues