Update file dependency to 7.0.0

[danielgomezrico]

Description
I cannot use the library because I'm using another dependency that uses file 7.0.0 and dart-code-linter has the version fixed at 6.

Because every version of dart_code_linter depends on file ^6.0.0 and flutter_cache_manager 3.3.2 depends on file ^7.0.0, dart_code_linter is incompatible with flutter_cache_manager 3.3.2.
So, because drivers_app depends on both flutter_cache_manager 3.3.2 and dart_code_linter 1.1.3, version solving failed.

Why do you consider it necessary?
Because new libraries use newer versions and so this cannot be used in some projects.

[app-toolkit-opensource-innersource]

Assign to review: @santitigaga @ajtortolero