Update modernize-dotnet plugin to 1.0.1119-preview1

[anvillan]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• I have read and followed the Guidance for submissions involving paid services.
• My contribution adds a new instruction, prompt, agent, skill, or workflow file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, skill, or workflow with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.
• I am targeting the staged branch for this pull request.

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Description

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Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New plugin.
• New skill file.
• New agentic workflow.
• Update to existing instruction, prompt, agent, plugin, skill, or workflow.
• Other (please specify):

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Additional Notes

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull request overview

Updates the external plugin catalog entry for modernize-dotnet and keeps the generated marketplace output in sync.

Changes:

• Bumps modernize-dotnet from 1.0.1102-preview1 to 1.0.1119-preview1.
• Regenerates marketplace metadata for the updated external plugin.
• Normalizes two em dash descriptions in plugins/external.json without changing their meaning.

Show a summary per file

File	Description
plugins/external.json	Updates the source external plugin metadata for modernize-dotnet.
.github/plugin/marketplace.json	Reflects the generated marketplace version bump.

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 0