Fixed

• Resolve APNS :too_many_provider_token_updates by moving token generation into APNS.Token (#227).
• Support HTTPoison 2.0. (#236)
• Improve handling of FCM error responses. (#245)
• Fix DispatcherWorker missing a clause for {:stop, reason} in the init function.
• APNS.Config keys now decode properly for PEMs generated with OpenSSL 3. (#248)
• Add ExpiredToken as APNS error response. (#240)
• Better handling of APNS token lifecycle between :dev/:prod environments with the same key identifier. (#239)