feat: support for Roslyn 4.7

[latonz]

Roslyn 4.7, C# 12 Preview, .NET 8.0

Description

Upgrades to .net8.0 / C#12 preview / Roslyn 4.7.
Fixes #682

Checklist

• The existing code style is followed
• The commit message follows our guidelines
• Performed a self-review of my code
• Hard-to-understand areas of my code are commented
• The documentation is updated (as applicable)
• Unit tests are added/updated
• Integration tests are added/updated (as applicable, especially if feature/bug depends on roslyn or framework version in use)

[latonz]

We should probably await the first RC of .NET 8.0.

[codecov]

Codecov Report

Merging #718 (48733b9) into main (1fed304) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #718      +/-   ##
==========================================
- Coverage   91.36%   91.30%   -0.07%     
==========================================
  Files         201      201              
  Lines        6651     6628      -23     
  Branches      821      821              
==========================================
- Hits         6077     6052      -25     
- Misses        385      387       +2     
  Partials      189      189              

see 6 files with indirect coverage changes

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[github-actions]

🎉 This PR is included in version 3.2.0 🎉

The release is available on:

• GitHub release
• v3.2.0

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