Mobile: Update Unity IAP package to 4.4.0

[ChrisNZL]

Tallowmere 2 version 0.3.5f uses Unity In App Purchasing 4.1.4.

Need to update to 4.4.0.

• Unity forum post

Notable changes:

The In-App Purchasing package now requires Unity Gaming Services to have been initialized before it can be used. For the time being IAP will continue working as usual, but will log a warning if Unity Gaming Services has not been initialized. In future releases of this package, initializing Unity Gaming Services will be mandatory. Please see the documentation for more details.

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Initialize Unity Gaming Services

Call UnityServices.InitializeAsync() to initialize all Unity Gaming Services at once. It returns a Task that enables you to monitor the initialization's progression.

Possibly can have this be initialized automatically without coding anything:

[ChrisNZL]

Done.