Bump environs from 9.4.0 to 9.5.0 in /requirements

Created by: dependabot[bot]

Bumps environs from 9.4.0 to 9.5.0.

Changelog

Sourced from environs's changelog.

9.5.0 (2022-01-30)

Features:

• Allow callables or custom marshmallow fields to be passed to subcast, subcast_keys, and subcast_values. (#241). Thanks bvanelli for the PR.

Commits

• 74e0edb Bump version and update changelog
• 9199ab5 Add support for custom functions on subcast. (#241)
• See full diff in compare view

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