chore(deps): update dependency plugin_platform_interface to v2.1.8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
plugin_platform_interface (source)	dev_dependencies	patch	2.1.4 -> 2.1.8

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Release Notes

flutter/packages (plugin_platform_interface)

v2.1.8

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• Fixes new lint warnings.

v2.1.7

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• Changes MockPlatformInterfaceMixin to a mixin class for better compatibility with projects that have a minumum Dart SDK version of 3.0.
• Updates minimum supported SDK version to Dart 3.0.

v2.1.6

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• Adds pub topics to package metadata.
• Updates minimum supported SDK version to Flutter 3.7/Dart 2.19.

v2.1.5

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• Updates README to improve example and discuss base.
• Updates minimum Flutter version to 3.3.

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