Downgrade to dotnet-validate 0.0.1-preview.42

Version 0.0.1-preview.51 introduced a bug when using absolute paths. The fix has been merged but a new version of the tool is not yet released: NuGetPackageExplorer/NuGetPackageExplorer#1229

Author: 0xced

.config/dotnet-tools.json

@@ -9,7 +9,7 @@
       ]
     },
     "dotnet-validate": {
-      "version": "0.0.1-preview.51",
+      "version": "0.0.1-preview.42",
       "commands": [
         "dotnet-validate"
       ]