[google_maps_flutter] ios build fix

[OreOreDa]

Description

Create a new Flutter project with "flutter create"
Add the latest google maps flutter plugin in pubspec.yaml
build for iOS fails with latest version of XCode / Flutter SDK with error "GoogleMapsBase not found", because of GoogleMaps.framework headers:
#if __has_feature(modules)
@import GoogleMapsBase; <--- this is taken by default with a non-modified Flutter project
#else
#import <GoogleMapsBase/GoogleMapsBase.h>
#endif

This is a known issue, it has been solved for React Native : https://github.com/googlemaps/google-maps-ios-utils/pull/20/files

Related Issues

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• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
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Breaking Change

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[OreOreDa]

Some checks failed due to github timeouts (?), I re created this PR to have the checks run again, and have the green mark

[iskakaushik]

@OreOreDa could you please edit the pubspec.yaml change version to 0.5.18 and also add a new changelog entry, not edit the current one?

[OreOreDa]

Sure, Iska 👍 Done

[iskakaushik]

LGTM. This fixes flutter/flutter#34042