Added net9.0 target framework to all projects

[armanossiloko]

I've increased the projects' minor versions only because there shouldn't be anything that breaks in the existing packages for net8.0, net9.0 was just added on top of it.

[armanossiloko]

On an unrelated note, the netstandard2.0 packages have a bunch of references with (high) vulnerabilities. Personally, I would just drop netstandard2.0 support at this point. People had enough time (years) to move on to anything newer anyway.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.03%. Comparing base (86ff5dd) to head (2f0f4d7).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
+ Coverage   81.94%   82.03%   +0.09%     
==========================================
  Files          31       31              
  Lines        1102     1102              
  Branches      125      123       -2     
==========================================
+ Hits          903      904       +1     
  Misses        159      159              
+ Partials       40       39       -1     

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[armanossiloko]

@khellang Want me to abandon the PR in case there's no plans to add net9.0 to the supported frameworks?

[Caldas]

@khellang I also would benefit from this PR. Do you think we could go ahead with it?

[armanossiloko]

Closing due to no review of the PR - cleaning up my forks.