chore(deps): update dependency ffigen to v14

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ffigen (source)	dev_dependencies	major	^13.0.0 -> ^14.0.0

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Release Notes

dart-lang/native (ffigen)

v14.0.0

• Create a public facing API for ffigen that can be invoked as a library:
  void generate(Config config). Make Config an implementatble interface,
  rather than needing to be parsed from yaml.
• Add a external-versions config option. Setting the minimum target
  version will omit APIs from the generated bindings if they were deprecated
  before this version.
• Global variables using ObjC types (interfaces or blocks) will now use the
  correct Dart wrapper types, instead of the raw C-style pointers.
• Rename assetId under ffi-native to asset-id to follow dash-case.
• Breaking change: ObjC blocks are now passed through all ObjC APIs as
  ObjCBlock<Ret Function(Args...)>, instead of the codegenned
  ObjCBlock_... wrapper. The wrapper is now a non-constructible set of util
  methods for constructing ObjCBlock.
• Breaking change: Generated ObjC code has been migrated to ARC (Automatic
  Reference Counting), and must now be compiled with ARC enabled. For example,
  if you had a line like s.requires_arc = [] in your podspec, this should
  either be removed, or you should add the ffigen generated ObjC code to the
  list. If you're compiling directly with clang, add the -fobjc-arc flag.
• Breaking change: Structs with enum members now generate their members
  as Dart enum values as well. For example, with an enum MyEnum and a struct
  with a member MyEnum enumMember, two members are generated: enumMemberAsInt
  which contains the original integer value, and enumMember, which is of type
  MyEnum. If you configure the enum to be generated as Dart integers, this
  new behavior will not apply, and the struct member will be an integer as well.
• Breaking change: Enums generated as integers will now generate sealed
  classes as opposed to abstract classes.
• Fix some bugs in the way ObjC method families and ownership annotations were
  being handlhttps://github.com/dart-lang/native/issues/14461446
• Apply the existing member-rename option to ObjC interface and protocol
  methods and properties.
• Add a member-filter option that filters ObjC interface and protocol methods
  and properties.

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