[dotnet] Align paket target framework with supported versions

[nvborisenko]

User description

csproj and bazel are aligned, we use net8.0 and netstandard.

Motivation and Context

Align paket target frameworks.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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PR Type

Enhancement

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Description

• Updated paket.dependencies to align target frameworks.

• Changed framework from net7.0 to net8.0.

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Changes walkthrough 📝

	Relevant files
Enhancement	paket.dependencies Update target framework in `paket.dependencies`                    dotnet/paket.dependencies Updated the target framework from net7.0 to net8.0. Ensured alignment with supported framework versions. +1/-1

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[qodo-merge-pro]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Score
General	Ensure backward compatibility during upgrade Verify that all dependencies are compatible with .NET 8.0 before upgrading the target framework, as some packages might not have been updated yet. dotnet/paket.dependencies [2] -framework: net8.0,netstandard2.0 +framework: net8.0,net7.0,netstandard2.0 Apply this suggestion Suggestion importance[1-10]: 7 Why: The suggestion to maintain compatibility with net7.0 during the upgrade is valuable for ensuring a smoother transition and reducing potential breaking changes, especially if some dependencies haven't been updated for net8.0 yet.	7