Bump version to 2.1.1 in installer and package; update project references

[IvanMurzak]

This pull request contains a minor version bump for the PlayerPrefsEx package, along with some small adjustments to project configuration and test references.

• Version update:

  • Updated the package version from 2.1.0 to 2.1.1 in both Installer.cs and package.json to reflect the new release. [1] [2]

• Project and test configuration:

  • Removed the UnityEditor.TestRunner reference from the Extensions.Unity.PlayerPrefsEx.Tests.asmdef file, likely to streamline test dependencies.
  • Reordered the inclusion of Extensions.Unity.PlayerPrefsEx.Tests.csproj in the Unity-Package.slnx solution file, moving it above the sample project.

[Copilot]

Pull request overview

This PR bumps the package version from 2.1.0 to 2.1.1 and corrects project configurations.

• Updates package version to 2.1.1
• Corrects Runtime test assembly references by removing Editor-specific dependency
• Reorders solution project references

Reviewed changes

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

File	Description
Unity-Package/Assets/root/package.json	Updates package version from 2.1.0 to 2.1.1
Unity-Package/Unity-Package.slnx	Reorders project references, moving Tests project before main project
Unity-Package/Assets/root/Tests/Runtime/Extensions.Unity.PlayerPrefsEx.Tests.asmdef	Removes UnityEditor.TestRunner reference from Runtime tests (correct fix as this is an Editor-only assembly)

The changes in this PR are all appropriate. The version bump is clean, the solution file reordering is a stylistic improvement, and the removal of UnityEditor.TestRunner from the Runtime tests assembly definition is a correct fix since that assembly reference is Editor-specific and should not be included in Runtime tests (only in Editor tests, where it properly remains).

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