Bump AltCover from 8.9.3 to 9.0.1

Bumps [AltCover](https://github.com/SteveGilham/altcover) from 8.9.3 to 9.0.1.
- [Release notes](https://github.com/SteveGilham/altcover/releases)
- [Changelog](https://github.com/SteveGilham/altcover/blob/master/ReleaseNotes.md)
- [Commits](SteveGilham/altcover@release/v8.9.3...release/v9.0.1)

---
updated-dependencies:
- dependency-name: AltCover
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

UnitTests/UnitTests.csproj

@@ -29,7 +29,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="AltCover" Version="8.9.3" />
+    <PackageReference Include="AltCover" Version="9.0.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="nunit" Version="4.2.2" />