Bump NUnit.ConsoleRunner from 3.12.0 to 3.15.2

Bumps [NUnit.ConsoleRunner](https://github.com/nunit/nunit-console) from 3.12.0 to 3.15.2.
- [Release notes](https://github.com/nunit/nunit-console/releases)
- [Changelog](https://github.com/nunit/nunit-console/blob/main/CHANGES.txt)
- [Commits](nunit/nunit-console@v3.12...3.15.2)

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

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

Author: dependabot[bot]

tests/IntegrationTests/packages.config

@@ -2,5 +2,5 @@
 <packages>
   <package id="IKVM" version="8.1.5717.0" targetFramework="net45" />
   <package id="NUnit" version="3.13.2" targetFramework="net45" />
-  <package id="NUnit.ConsoleRunner" version="3.12.0" targetFramework="net45" />
+  <package id="NUnit.ConsoleRunner" version="3.15.2" targetFramework="net45" />
 </packages>