[dependabot-bundler] nuget: Directory.Packages.props

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This issue bundles open Dependabot pull requests for the **NuGet** ecosystem targeting the **`Directory.Packages.props`** manifest file.

## Bundled PRs

- #10933 — Bump OpenTelemetry and OpenTelemetry.Exporter.OpenTelemetryProtocol
- `OpenTelemetry`: 1.15.3 → 1.18.0
- `OpenTelemetry.Exporter.OpenTelemetryProtocol`: 1.15.3 → 1.18.0
- Also updates `samples/Playground/Playground.csproj` to drop the pinned `VersionOverride` in favor of the centrally managed version.

This issue will be kept up to date as new Dependabot PRs for this runtime/manifest combination are opened, and entries will be removed once their PRs are merged or closed.

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Review the bundled Dependabot PR #10933 alongside Directory.Packages.props and samples/Playground/Playground.csproj. Confirm the OpenTelemetry versions and removal of the pinned VersionOverride, then treat the work as done when the pull request is merged or closed.

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