application: ApplicationInfo: Switch to PackageInfoCompat for fetching version code

- Current method has been deprecated and alternative is limited to API 28

References:
- [1]: https://developer.android.com/reference/android/content/pm/PackageInfo#versionCode
- [2]: https://developer.android.com/reference/androidx/core/content/pm/PackageInfoCompat#getLongVersionCode(android.content.pm.PackageInfo)



Signed-off-by: Aayush Gupta <theimpulson@e.email>