Update .NET SDK

Version updated for martincostello/update-dotnet-sdk to version v3.0.0.

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Release notes

What’s Changed

• Refactor inline PowerShell by @martincostello in https://github.com/martincostello/update-dotnet-sdk/pull/572
• Update to Node.js v20 by @martincostello in https://github.com/martincostello/update-dotnet-sdk/pull/599

Full Changelog: https://github.com/martincostello/update-dotnet-sdk/compare/v2.5.0...v3.0.0

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