chore: update dependency dotnet-sdk to v7.0.408 · YoloDev/YoloDev.CodeGen@fc904b3

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, actions/setup-dotnet@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

🔨 Build: src/Shims/InterpolatedStrings.cs#L3

Convert to file-scoped namespace (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0161)

🔨 Build: src/Shims/Index.cs#L10

Convert to file-scoped namespace (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0161)

🔨 Build: src/Shims/Range.cs#L14

Convert to file-scoped namespace (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0161)

🔨 Build: src/sourcegen/YoloDev.CodeGen.SourceGenerator/CodeGenHelpersGenerator.cs#L3

Convert to file-scoped namespace (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0161)

🔨 Build: src/Shims/Nullable.cs#L23