chore: Add renovate.json (#100)

Author: NumaryBot

renovate.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "github>formancehq/shared-config//renovate/presets/golang"
+  ],
+  "ignoreDeps": [
+    "github.com/formancehq/webhooks/pkg/client"
+  ]
+}