Update dependency environs to v14

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
environs (changelog)	11.2.1 -> 14.0.0

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Release Notes

sloria/environs (environs)

v14.0.0

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Features:

• Add env singleton ([#​194]).
  Thanks AndBondStyle for the suggestion.

from environs import env

Changes:

• default values are expected to be their in their deserialized form.
  Backwards-incompatible: Passing serialized values to default
  is no longer supported.

from datetime import date, timedelta
import environs

v13.0.0

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Features:

• Typing: Add type hints for parser methods (#​367).
  Thanks OkeyDev for the PR.

Other changes:

• Drop support for marshmallow<3.18.0.
• Backwards-incompatible: Remove load_default param from parser methods. Use default instead.
• Backwards-incompatible: Rename Env.enum's type param to enum.
• Backwards-incompatible: Remove ignore_case param from Env.enum.
• Backwards-incompatible: Remove
  allow_none, error_messages, and metadata params from parser methods.

v12.0.0

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Features:

• Env.enum allows passing an Enum as default.

Other changes:

• Support marshmallow 4.
• Support Python 3.9-3.13.
• Backwards-incompatible: Make Field classes private. Users should
  not need to access these.

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