feat(ios): increase firebase framework to 7.11.0

[ollm]

Description

Plugin cannot be installed in parallel with https://github.com/admob-plus/admob-plus or https://github.com/chemerisuk/cordova-plugin-firebase-analytics because of incompatible Firebase SDK versions.

Related Issue

#84

Motivation and Context

I use the plugin together with admob-plus and cordova-plugin-firebase-analytics

How Has This Been Tested?

cordova platform rm ios
cordova plugin add cordova-plugin-push
cordova platform add ios@6.2.0
cd platforms/ios
pod install

I have tested it on an iPhone 6s with iOS 14.5 and notifications are received without problems, except when the application is in the foreground, the event push.on('notification', function(){}); does not fire, I don't know if this bug is due to the changes or it was already present in the plugin.

I'm not very familiar with Objective-C and the Firebase SDK, so I'm not sure if the removed identifiers would have to be replaced with something.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[erisu]

Closing out this PR as PR #152 bumped the firebase framework to 8.1.1 and was merged into the main branch.

Thank you for your PR submission.