Update dependency dotnet-outdated-tool to 4.6.8 (#1233)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.config/dotnet-tools.json

@@ -48,7 +48,7 @@
             "rollForward": false
         },
         "dotnet-outdated-tool": {
-            "version": "4.6.7",
+            "version": "4.6.8",
             "commands": ["dotnet-outdated"],
             "rollForward": false
         },