While executing this in the plugin folder e.g. node_modules@capacitor-community\fcm it correctly updates the @capacitor dependencies of the plugins package.json file to "^5.0.0". But then it stops with:

Error: spawn npm ENOENT

I guess this is the reason it also doesn't e.g. update the build.gradle file to put the namespace parameter from the manifest file in it:

android { namespace "com.getcapacitor.community.fcm.fcm"

Or it doesn't place this for Android API 33 notifications mandatory permission in the manifest file (if not the plugin author of @capacitor-community\fcm or rather the one of @capacitor/push-notifications should update that in the first place):
<uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>

As I've read (https://stackoverflow.com/a/27688805/11890464) this could be related to how the subprocess is spawned in migrate-capacitor-plugin/src/subprocess.ts.

Or it has something to do with how my system (windows) is setup?
node: 20.1.0 / npm: 9.6.4 (via nvm)

I use pnpm an the command crash on my plugin.
i think i can do a PR with https://www.npmjs.com/package/detect-package-manager to fix it