Fix break in tests from VS 17.3

[AArnott]

This is a workaround suggested in dotnet/msbuild#7873

[codecov]

Codecov Report

Base: 81.43% // Head: 77.31% // Decreases project coverage by -4.12% ⚠️

Coverage data is based on head (b6d0df4) compared to base (538af29).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #805      +/-   ##
==========================================
- Coverage   81.43%   77.31%   -4.13%     
==========================================
  Files          73       73              
  Lines        3830     3830              
==========================================
- Hits         3119     2961     -158     
- Misses        711      869     +158     

Impacted Files	Coverage Δ
.../Nerdbank.GitVersioning.Tasks/NativeVersionInfo.cs	0.00% <0.00%> (-85.48%)	⬇️
src/Nerdbank.GitVersioning.Tasks/AssemblyLoader.cs	0.00% <0.00%> (-53.85%)	⬇️
...c/NerdBank.GitVersioning/ManagedGit/FileHelpers.cs	48.48% <0.00%> (-51.52%)	⬇️
...c/Nerdbank.GitVersioning.Tasks/ContextAwareTask.cs	68.96% <0.00%> (-24.14%)	⬇️
...erdbank.GitVersioning.Tasks/AssemblyVersionInfo.cs	62.71% <0.00%> (-6.50%)	⬇️
src/NerdBank.GitVersioning/ManagedGit/GitPack.cs	86.44% <0.00%> (-1.70%)	⬇️
...Bank.GitVersioning/LibGit2/LibGit2GitExtensions.cs	91.87% <0.00%> (-1.02%)	⬇️
...rc/Nerdbank.GitVersioning.Tasks/GetBuildVersion.cs	90.51% <0.00%> (-0.73%)	⬇️

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