chore: update release-please-config.json

Author: fabianbormann

release-please-config.json

@@ -2,25 +2,26 @@
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
   "release-type": "simple",
   "bump-minor-pre-major": true,
-  "extra-files": [
-    {
-      "type": "xml",
-      "path": "pom.xml",
-      "xpath": "//project/version"
-    },
-    {
-      "type": "xml",
-      "path": "calculation/pom.xml",
-      "xpath": "//project/parent/version"
-    },
-    {
-      "type": "xml",
-      "path": "validation/pom.xml",
-      "xpath": "//project/parent/version"
-    },
-    "README.md"
-  ],
   "packages": {
-    ".":{}
+    ".":{
+      "extra-files": [
+          {
+            "type": "xml",
+            "path": "pom.xml",
+            "xpath": "//project/version"
+          },
+          {
+            "type": "xml",
+            "path": "calculation/pom.xml",
+            "xpath": "//project/parent/version"
+          },
+          {
+            "type": "xml",
+            "path": "validation/pom.xml",
+            "xpath": "//project/parent/version"
+          },
+          "README.md"
+        ]
+    }
   }
-}
+}