Update OpenTelemetry to 1.13.1

[lullen]

This PR contains the following updates:

Package	Type	Update	Change
OpenTelemetry.Exporter.OpenTelemetryProtocol (source)	nuget	minor	1.12.0 -> 1.13.1
OpenTelemetry.Extensions.Hosting (source)	nuget	minor	1.12.0 -> 1.13.1

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Release Notes

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

v1.13.1

Release details: 1.13.1

• In version 1.13.0, the digital signature (.dll-keyless.sig) and
  certificate (.dll-keyless.pem) files were unintentionally omitted from the
  published NuGet packages.
• This hotfix restores the Sigstore signing artifacts for all target frameworks
  (net462, netstandard2.0, netstandard2.1, net8.0, net9.0), ensuring
  the integrity of DLL verification using Sigstore cosign.

v1.13.0

Release details: 1.13.0

• gRPC calls to export traces, logs, and metrics using OtlpExportProtocol.Grpc
  now set the TE=trailers HTTP request header to improve interoperability.
• EventName is now exported by default as EventName instead of
  logrecord.event.name when specified through ILogger or the experimental
  log bridge API.

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