Configure Renovate (#443)

* Add renovate.json

* Apply suggestion from @ludeeus

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Joakim Sørensen <joasoe@proton.me>

Author: renovate[bot]

renovate.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ],
+  "labels": [
+    "dependencies"
+  ]
+}