Unable to install packages in `/example/pubspec.yaml`

[hpelitebook745G2]

Running flutter pub get will give:

Note: file is pinned to version 7.0.0 by integration_test from the flutter SDK.
See https://dart.dev/go/sdk-version-pinning for details.

Because ffigen 8.0.2 depends on file ^6.0.0 and no versions of ffigen match >8.0.2 <9.0.0, ffigen ^8.0.2 requires file
  ^6.0.0.
And because every version of integration_test from sdk depends on file 7.0.0 and every version of polygonid_flutter_sdk
  from path depends on ffigen ^8.0.2, integration_test from sdk is incompatible with polygonid_flutter_sdk from path.
So, because polygonid_flutter_sdk_example depends on both polygonid_flutter_sdk from path and integration_test from sdk,
  version solving failed.

Adding this in /example/pubspec.yaml:

dependency_overrides:
  file: 7.0.0

will produce new error:

Resolving dependencies...
Because polygonid_flutter_wrapper depends on polygonid_flutter_sdk from path which depends on path_provider ^2.0.15, path_provider ^2.0.15 is required.
So, because polygonid_flutter_wrapper depends on path_provider 2.0.11, version solving failed.

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