Update dependency TUnit to 1.9.81

Author: Nice3point

Directory.Packages.props

@@ -25,7 +25,7 @@
         <PackageVersion Include="ILRepack" Version="2.0.44"/>
 
         <!-- Testing -->
-        <PackageVersion Include="TUnit" Version="1.7.20"/>
+        <PackageVersion Include="TUnit" Version="1.9.81"/>
         <PackageVersion Include="Shouldly" Version="4.3.0"/>
 
         <!-- Development Tools -->