Bump .NET 11 NuGet packages to preview 5

[glen-84]

Summary

• Bumps the net11 block of Directory.Packages.props from preview 4 to preview 5: EF Core, ASP.NET, Microsoft.Extensions.*, System.*, and Npgsql.EntityFrameworkCore.PostgreSQL (+ .NetTopologySuite, .NodaTime).
• Completes the preview 5 move started by the SDK bump (Bump .NET 11 SDK pin to 11.0.100-preview.5.26302.115 #9958): now that Npgsql.EntityFrameworkCore.PostgreSQL 11.0.0-preview.5 has shipped, the packages align with the preview 5 SDK, ending the temporary mixed SDK-P5 / packages-P4 setup.
• The net8/9/10 package blocks are untouched.

Test plan

• Clean restore + build on the preview 5 SDK with no NuGet version conflicts (TreatWarningsAsErrors is on).
• PostgreSQL integration tests (EF Core + Npgsql at preview 5): 40/40 pass against a real Postgres.

[Copilot]

Pull request overview

This PR aligns the net11.0 centrally-managed NuGet package versions with the already-updated .NET 11 preview 5 SDK pin, completing the move from preview 4 to preview 5 (notably including the Npgsql EF Core provider).

Changes:

• Bumped all net11.0 Microsoft.AspNetCore / EF Core / Microsoft.Extensions / System.* package versions from 11.0.0-preview.4.26230.115 to 11.0.0-preview.5.26302.115.
• Bumped Npgsql.EntityFrameworkCore.PostgreSQL (and .NetTopologySuite, .NodaTime) from 11.0.0-preview.4 to 11.0.0-preview.5.

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[github-code-quality]

Code Coverage Overview

Languages: C#

C# / code-coverage/dotnet

The overall coverage in the gai/bump-net11-packa... branch remains at 49%, unchanged from the main branch.

Show a code coverage summary of the most impacted files.

File	main 0aae53f	gai/bump-net11-packa... be10e89	+/-
/home/runner/wo...ageProcessor.cs	100%	89%	-11%
/home/runner/wo...onMiddleware.cs	94%	88%	-6%
/home/runner/wo...ddlewareBase.cs	67%	66%	-1%
/home/runner/wo...cutorManager.cs	93%	92%	-1%
/home/runner/wo...tocolHandler.cs	85%	85%	0%
/home/runner/wo...nManagerBase.cs	82%	83%	+1%
/home/runner/wo...DefaultTopic.cs	88%	89%	+1%
/home/runner/wo...eiveEndpoint.cs	68%	72%	+4%
/home/runner/wo...ntialBackoff.cs	78%	88%	+10%
/home/runner/wo...sageRecorder.cs	88%	100%	+12%

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