Update dependency dotnet-outdated-tool to v4.6.9

Author: renovate[bot]

.config/dotnet-tools.json

@@ -43,7 +43,7 @@
             "rollForward": false
         },
         "dotnet-outdated-tool": {
-            "version": "4.6.8",
+            "version": "4.6.9",
             "commands": ["dotnet-outdated"],
             "rollForward": false
         },