.NET 9 SDK updates

[sveinungf]

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[codecov]

Codecov Report

Attention: Patch coverage is 83.87097% with 5 lines in your changes missing coverage. Please review.

Project coverage is 89.89%. Comparing base (d302f75) to head (1dc84c4).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
...Cheetah/MetadataXml/Styles/NumberFormatsXmlPart.cs	78.57%	0 Missing and 3 partials ⚠️
SpreadCheetah/MetadataXml/DataValidationXml.cs	81.81%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
- Coverage   89.98%   89.89%   -0.09%     
==========================================
  Files         152      152              
  Lines        5450     5455       +5     
  Branches     1020     1018       -2     
==========================================
  Hits         4904     4904              
  Misses        211      211              
- Partials      335      340       +5     

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[github-actions]

Test Results

     9 files   -     2       9 suites   - 2   11m 20s ⏱️ +14s
 4 521 tests +    8   4 521 ✅ +    8  0 💤 ±0  0 ❌ ±0 
13 257 runs   - 4 366  13 257 ✅  - 4 366  0 💤 ±0  0 ❌ ±0 

Results for commit 1dc84c4. ± Comparison against base commit d302f75.