Configure renovate.json to ignore uconfig v1.2.1 dep (#296)

The `uconfig` package is being updated to version v1.2.1, but this
version has been retracted on it's `go.mod` file. Renovate Bot is
attempting to update the version anyway. Since there are no changes, the
update is harmless. Even so, I think it's a good idea to avoid updating
to retracted versions.

renovate.json

@@ -5,6 +5,9 @@
   },
   "extends": ["config:base", ":semanticCommits"],
   "postUpdateOptions": ["gomodTidy", "gomodUpdateImportPaths"],
+  "ignoreDeps": [
+    "github.com/omeid/[email protected]"
+  ],
   "packageRules": [
     {
       "groupName": "all non-major dependencies",