craft-grammar does not coerce numbers to strings in annotated types

[mr-cal]

Pydantic 2 requires coerce_numbers_to_str = True to be set, but this does not work for annotated types, such as craft-application's SingleEntryDict:

SingleEntryDict = Annotated[
    dict[T, Tv],
    pydantic.Field(min_length=1, max_length=1),
]

Parsing the following with craft-grammar

build-environment:
  - CGO_ENABLED: 0

produces

 >       v = ValidationTest(**data)
  E       pydantic_core._pydantic_core.ValidationError: 1 validation error for ValidationTest
  E       build_environment
  E         Value error, value must be a list of Annotated: [{'CGO_ENABLED': 0}] [type=value_error, input_value=[{'CGO_ENABLED': 0}], input_type=list]
  E           For further information visit https://errors.pydantic.dev/2.9/v/value_error

See full logs in this PR: #46

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3389.

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