fix(deps): update dependency get_it to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
get_it	dependencies	major	^7.1.4 -> ^8.0.0

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Release Notes

flutter-it/get_it (get_it)

v8.2.0

Thanks to PR by @​Hu-Wentao we now expose part of the internal state of get_it so tool authors have more options. While doing so internal renaming has happened, so where previously where the term "ServiceFactory" was uses we not use consistently ObjectRegistration and instead of variables with factory in the name we use registration this has not impact on the public API so it is not a breaking change.

v8.1.0

• adding documentation https://github.com/flutter-it/get_it/issues/4111
• registerCachedFactoryAsync usded FactoryFunc instead of FactoryFuncAsync https://github.com/flutter-it/get_it/issues/4100
• adding getMaybe which will return null instead of throwing an exception in case a type is not registered
• dependsOn of registerSingletonWithDependencies is now required. Although this could be seen as a breaking change, if you didn't pass dependsOn your code wouldn't have worked before so I won't define this as breaking change

v8.0.3

• fixing linter warning thanks to @​PatrickChrestin

v8.0.2

• Fixes by @​kuhnroyal and @​ArtAhmetajCR who spotted some flaws in my latest changes. Thanks a lot

v8.0.1

• Bugfixes and improvements for certain edge cases thanks to @​KnightOfBlackLily and @​kuhnroyal

v8.0.0

• official new release with all the changes

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