Prepare for OpenAPI.NET 3.0

[martincostello]

Cherry-pick some changes from #3646 to reduce the diff.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.75%. Comparing base (70e4cb3) to head (7854a5c).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3647   +/-   ##
=======================================
  Coverage   94.75%   94.75%           
=======================================
  Files         110      110           
  Lines        3831     3834    +3     
  Branches      760      764    +4     
=======================================
+ Hits         3630     3633    +3     
  Misses        201      201           

Flag	Coverage Δ
Linux	94.75% <100.00%> (+<0.01%)	⬆️
Windows	94.75% <100.00%> (+<0.01%)	⬆️
macOS	94.75% <100.00%> (+<0.01%)	⬆️

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[Copilot]

Pull Request Overview

This PR prepares the codebase for OpenAPI.NET 3.0 by updating type instantiations and adding type checks to handle the transition from concrete types to interface types in the OpenAPI.NET library.

• Replaces target-typed new() expressions with explicit new OpenApiMediaType() in test and benchmark files
• Adds type checks before accessing properties on dictionary values that may return interface types
• Updates package versions for test dependencies
• Changes explicit type declarations to var in TryGetValue calls for consistency

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/Swashbuckle.AspNetCore.SwaggerGen.Test/VerifyTests.cs	Updated test instantiations from target-typed new to explicit OpenApiMediaType constructor
test/Swashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs	Updated test instantiations from target-typed new to explicit OpenApiMediaType constructor
src/Swashbuckle.AspNetCore.SwaggerGen/XmlComments/XmlCommentsRequestBodyFilter.cs	Added type checks before casting Content dictionary values to concrete OpenApiMediaType
src/Swashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/SwaggerGenerator.cs	Added type checks and continue logic to safely handle interface types in Content dictionaries
src/Swashbuckle.AspNetCore.ApiTesting/ResponseValidator.cs	Changed explicit type to var in TryGetValue for consistency
src/Swashbuckle.AspNetCore.ApiTesting/RequestValidator.cs	Changed explicit type to var in TryGetValue for consistency
perf/Swashbuckle.AspNetCore.Benchmarks/XmlCommentsBenchmark.cs	Updated benchmark instantiation from target-typed new to explicit OpenApiMediaType constructor
Directory.Packages.props	Updated test dependency versions (MartinCostello.Logging.XUnit.v3, Microsoft.Playwright, Microsoft.NET.Test.Sdk, NSwag.MSBuild)

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