chore: add renovate bot (#306)

Author: saihaj

renovate.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "github>the-guild-org/shared-config:renovate",
+    ":preserveSemverRanges"
+  ],
+  "packageRules": []
+}