Update modernize-dotnet plugin to 1.0.1133-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 listed version of the external modernize-dotnet plugin so the repository’s external plugin registry and generated marketplace metadata reflect the new release.

Changes:

• Bumped modernize-dotnet version in plugins/external.json to 1.0.1133-preview1.
• Updated the generated .github/plugin/marketplace.json entry to match the new external plugin version.

Show a summary per file

File	Description
plugins/external.json	Updates the modernize-dotnet external plugin version.
.github/plugin/marketplace.json	Regenerates/updates marketplace metadata to reflect the new version.

Copilot's findings

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