Fix test step · aspnet/Benchmarks@80aab30

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

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Build: src/BenchmarksApps/Grpc/GrpcHttpApiServer/Server/obj/Debug/net8.0/Benchmark.cs#L8

The type name 'pb' only contains lower-cased ascii characters. Such names may become reserved for the language.

Build: src/BenchmarksApps/Grpc/GrpcHttpApiServer/Server/obj/Debug/net8.0/Benchmark.cs#L9

The type name 'pbc' only contains lower-cased ascii characters. Such names may become reserved for the language.

Build: src/BenchmarksApps/Grpc/GrpcHttpApiServer/Server/obj/Debug/net8.0/Benchmark.cs#L10

The type name 'pbr' only contains lower-cased ascii characters. Such names may become reserved for the language.

Build: src/BenchmarksApps/Grpc/GrpcHttpApiServer/Server/obj/Debug/net8.0/Benchmark.cs#L11

The type name 'scg' only contains lower-cased ascii characters. Such names may become reserved for the language.

Build: src/BenchmarksApps/Grpc/GrpcHttpApiServer/Server/obj/Debug/net8.0/BenchmarkGrpc.cs#L12

The type name 'grpc' only contains lower-cased ascii characters. Such names may become reserved for the language.

Build: src/BenchmarksApps/TLS/Kestrel/Program.cs#L154

Converting null literal or possible null value to non-nullable type.