chore(deps): update opentelemetry to 1.15.1

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
OpenTelemetry.Exporter.OpenTelemetryProtocol (source)	nuget	patch	1.15.0 → 1.15.1
OpenTelemetry.Extensions.Hosting (source)	nuget	patch	1.15.0 → 1.15.1

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Release Notes

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

v1.15.1

Release details: 1.15.1

• Breaking change: The Baggage API now disallows empty baggage names and
  treats baggage names and values as case sensitive, aligning with the latest
  Baggage API specification.
• Various bug fixes across OpenTelemetry.Api and OpenTelemetry SDK,
  including fixes for thread-safety, sampler edge cases, metrics precision,
  and observable instrument lifecycle handling.

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Configuration

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• If you want to rebase/retry this PR, check this box

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This PR has been generated by Renovate Bot.

[claude]

Dependency Update Review: OpenTelemetry 1.15.0 → 1.15.1

This is a straightforward Renovate-generated patch dependency bump. The changes are correct and safe. Here are my observations:

What the PR Does

Bumps two OpenTelemetry NuGet packages from 1.15.0 to 1.15.1 in two files that are structurally identical (both are Aspire ServiceDefaults projects):

• TUnit.Templates/content/TUnit.Aspire.Starter/ExampleNamespace.ServiceDefaults/ExampleNamespace.ServiceDefaults.csproj
• examples/CloudShop/CloudShop.ServiceDefaults/CloudShop.ServiceDefaults.csproj

Packages updated:

• OpenTelemetry.Exporter.OpenTelemetryProtocol: 1.15.0 → 1.15.1
• OpenTelemetry.Extensions.Hosting: 1.15.0 → 1.15.1

Correctness

The update is correct. After this PR, the two updated packages are now in sync with OpenTelemetry.Instrumentation.AspNetCore, which was already at 1.15.1. The other two instrumentation packages (OpenTelemetry.Instrumentation.Http and OpenTelemetry.Instrumentation.Runtime) remain at 1.15.0, but that is expected since no new releases for those are referenced in this PR.

Notable Change in 1.15.1

The release notes mention one breaking change: the Baggage API now disallows empty baggage names and treats baggage names/values as case sensitive, aligning with the OpenTelemetry specification. This is a spec-compliance fix in OpenTelemetry.Api. Since these packages are only used in the Aspire ServiceDefaults helper projects (templates and examples — not in TUnit's core engine or test runner), there is no risk to TUnit's core functionality.

Minor Observation: Version Skew Across OTel Instrumentation Packages

After this PR, the OpenTelemetry package versions across both affected .csproj files will be:

Package	Version
OpenTelemetry.Exporter.OpenTelemetryProtocol	1.15.1
OpenTelemetry.Extensions.Hosting	1.15.1
OpenTelemetry.Instrumentation.AspNetCore	1.15.1
OpenTelemetry.Instrumentation.Http	1.15.0
OpenTelemetry.Instrumentation.Runtime	1.15.0

The remaining two instrumentation packages still lag at 1.15.0. This is not a bug — it simply means no 1.15.1 release exists for those packages yet. Renovate will open follow-up PRs when those releases become available. No action needed here.

No Concerns for TUnit Core

These changes are scoped entirely to:

1. An Aspire template (TUnit.Templates) used for project scaffolding
2. A CloudShop example project

Neither path touches TUnit's core engine, source generator, reflection engine, or any AOT-sensitive code paths. No source generator snapshot tests are affected.

Overall this PR is clean and ready to merge.