Update dependency equatable to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
equatable	dependencies	major	^1.2.5 -> ^2.0.0

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Release Notes

felangel/equatable (equatable)

v2.0.5

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• fix: resolves T not a subtype of type 'Comparable<dynamic>' when computing hashCode

v2.0.4

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• fix: use SplayTreeSet to resolve inconsistent hashCode for properties of type Set (#​142)

v2.0.3

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• fix: revert EquatableMixin == to use Object (#​122)

v2.0.2

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• fix: Map prop with non-comparable key

v2.0.1

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• fix: hashCode should be the same for equal objects (Map fix)

v2.0.0

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• BREAKING: opt into null safety
  • feat!: upgrade Dart SDK constraints to >=2.12.0-0 <3.0.0
• BREAKING: stringify prints "null" for null properties instead of ""
• feat: EquatableConfig.stringify defaults to true in debug mode.
• fix: support legacy equality overrides with EquatableMixin
• fix: iterable equality comparisons (#​101)
• fix: stringify instance with long properties (#​94)
• chore: update dependencies
  • collection: ^1.15.0
  • meta: ^1.3.0
• docs: minor updates to README and example

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