Bump NUnit from 4.4.0 to 4.5.0

---
updated-dependencies:
- dependency-name: NUnit
  dependency-version: 4.5.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

OmopTransformerTests/OmopTransformerTests.csproj

@@ -23,7 +23,7 @@
     <PackageReference Include="MSTest.TestFramework" Version="4.1.0" />
     <PackageReference Include="coverlet.collector" Version="6.0.4" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
-    <PackageReference Include="NUnit" Version="4.4.0" />
+    <PackageReference Include="NUnit" Version="4.5.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.1.0" />
 </ItemGroup>