fix: release-please config

Author: claha

.github/release-please-config.json

@@ -1,7 +1,11 @@
 {
-  "release-type": "simple",
-  "package-name": "sensor-avanza-stock",
-  "extra-files": [
-    "custom_components/avanza_stock/manifest.json"
-  ]
+  "packages": {
+    ".": {
+      "release-type": "simple",
+      "package-name": "sensor-avanza-stock",
+      "extra-files": [
+        "custom_components/avanza_stock/manifest.json"
+      ]
+    } 
+  } 
 }