[release/8.0] Use latest .NET version in HttpStress runs

[rzikm]

The current runs seem to be stuck using 8.0.5, removing the 1xx suffix from dotnet-install -Version parameter seems to get the latest one (8.0.7).

Customer Impact

None, test-only change to make sure we consume the latest .NET 8 release in stress tests to pick up ASP.NET fixes.

Regression

No

Testing

Stress pipeline run as part of this PR.

Risk

Low, test-only change.

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[rzikm]

/azp run runtime-libraries stress-http

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[rzikm]

/azp run runtime-libraries stress-http

[rzikm]

/azp run runtime-libraries stress-ssl

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[rzikm]

Looks good

https://dev.azure.com/dnceng-public/public/_build/results?buildId=737134&view=logs&j=0bc77094-9fcd-5c38-f6e4-27d2ae131589

 Container httpstress-client-1  Created
Attaching to client-1, server-1
server-1  |        .NET Core: C:\live-runtime-artifacts\testhost\net8.0-windows-Release-x64\shared\Microsoft.NETCore.App\8.0.7\System.Private.CoreLib.dll, modified 7/11/2024 10:23:31 AM
server-1  |     ASP.NET Core: C:\live-runtime-artifacts\testhost\net8.0-windows-Release-x64\shared\Microsoft.AspNetCore.App\8.0.7\Microsoft.AspNetCore.dll, modified 6/14/2024 5:31:14 PM
server-1  |  System.Net.Http: C:\live-runtime-artifacts\testhost\net8.0-windows-Release-x64\shared\Microsoft.NETCore.App\8.0.7\System.Net.Http.dll, modified 7/11/2024 10:28:10 AM

https://dev.azure.com/dnceng-public/public/_build/results?buildId=737135&view=logs&j=0bc77094-9fcd-5c38-f6e4-27d2ae131589&t=f29c65c5-111e-5e1e-605e-ff26e95de907

Attaching to sslstress_server_1, sslstress_client_1
server_1  |            .NET Core: /live-runtime-artifacts/testhost/net8.0-linux-Release-x64/shared/Microsoft.NETCore.App/8.0.7/System.Private.CoreLib.dll, modified 07/11/2024 10:20:20
server_1  |  System.Net.Security: /live-runtime-artifacts/testhost/net8.0-linux-Release-x64/shared/Microsoft.NETCore.App/8.0.7/System.Net.Security.dll, modified 07/11/2024 10:25:35

[rzikm]

Test-only change => tell mode.

[rzikm]

/ba-g test failure is #88027