fix(deps): update dependency environs to v11

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
environs (changelog)	10.3.0 -> 11.0.0

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Release Notes

sloria/environs (environs)

v11.0.0

Compare Source

Fixes:

• Prevent DeprecationWarning getting raised by marshmallow 3.21.0 (:issue:333).

Other changes:

• Remove subcast_key argument of env.dict. Use subcast_keys instead.
• Bump minimum required marshmallow version to 3.13.0.
• Remove missing argument from Env methods. Use default instead.
• Remove subcast argument from Env methods that don't use it.
• Backwards-incompatible: Remove environs.__version__ variable.
  Use importlib.metadata.version("environs") instead.

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