Bump to SL-free ThisAssembly

[kzu]

No description provided.

[kzu]

🧪 Details on Microsoft Windows 10.0.26100

❌ NuGetizer.given_multitargeting_libraries.when_packing_on_build_then_succeeds(projectName: "uilibrary.csproj")

Assert.Equal() Failure: Values differ
Expected: Success
Actual:   Failure
   at Builder.TargetResult.AssertSuccess(ITestOutputHelper output) in /_/src/NuGetizer.Tests/Builder.NuGetizer.cs:line 206
   at NuGetizer.given_multitargeting_libraries.when_packing_on_build_then_succeeds(String projectName) in /_/src/NuGetizer.Tests/given_multitargeting_libraries.cs:line 29

🧪 Details on Microsoft Windows 10.0.26100

from dotnet-retest v1.0.0 on .NET 9.0.10 with 💜 by @devlooped

[Copilot]

Pull Request Overview

This PR updates the ThisAssembly package references from version 2.0.14 to version 2.1.2 across the codebase, removing SponsorLink dependencies as indicated by the "SL-free" designation in the PR title.

Key Changes:

• Updated ThisAssembly.Project from 2.0.14 to 2.1.2
• Updated ThisAssembly.Strings from 2.0.14 to 2.1.2
• Updated ThisAssembly.AssemblyInfo from 2.0.14 to 2.1.2

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/dotnet-nugetize/dotnet-nugetize.csproj	Updated ThisAssembly.Project and ThisAssembly.Strings package versions
src/NuGetizer.Tests/NuGetizer.Tests.csproj	Updated ThisAssembly.Project and ThisAssembly.Strings package versions
src/NuGetizer.Tasks/NuGetizer.Tasks.csproj	Updated ThisAssembly.Project and ThisAssembly.Strings package versions
src/CodeAnalysis/CodeAnalysis.csproj	Updated ThisAssembly.AssemblyInfo and ThisAssembly.Strings package versions

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[kzu]

@copilot suggest a fix for this test error:

 D:\a\nugetizer\nugetizer\src\NuGetizer.Tests\bin\Release\net472\Scenarios\given_multitargeting_libraries\uilibrary.csproj
 Target: Build
 The workload 'net8.0-maccatalyst' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/maui-support-policy for more information about the support policy.
 SupportedOSPlatformVersion 14.0 cannot be higher than TargetPlatformVersion 1.0.