Bump csharpier from 0.29.2 to 0.30.3 in /Difficalcy.Tests

Bumps [csharpier](https://github.com/belav/csharpier) from 0.29.2 to 0.30.3.
- [Release notes](https://github.com/belav/csharpier/releases)
- [Changelog](https://github.com/belav/csharpier/blob/main/CHANGELOG.md)
- [Commits](belav/csharpier@0.29.2...0.30.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

.config/dotnet-tools.json

@@ -9,10 +9,10 @@
       ]
     },
     "csharpier": {
-      "version": "0.29.2",
+      "version": "0.30.3",
       "commands": [
         "dotnet-csharpier"
       ]
     }
   }
-}
+}