chore: ignore formatting package.json

Ignore formatting package.json by the biome.js. The release-please re-formats
the package.json file when the version is updated. That modifies the
package.json with the different formatting than biome.js.

biome.json

@@ -1,6 +1,6 @@
 {
   "files": {
-    "ignore": ["__test__/data/"]
+    "ignore": ["__test__/data/", "package.json"]
   },
   "linter": {
     "enabled": true,