Bump environs from 9.3.5 to 9.4.0 in /requirements

Created by: dependabot[bot]

Bumps environs from 9.3.5 to 9.4.0.

Changelog

Sourced from environs's changelog.

9.4.0 (2022-01-04)

Bug fixes:

• Address warning about passing metadata in newer versions of marshmallow.

Other changes:

• Test against Python 3.10.

Commits

• 59023e1 Bump version, changelog, and LICENSE year
• 591d4c8 Address warning about passing metadata in newer marshmallow (#246)
• 5fc6229 Test against Python 3.10; reduce jobs (#237)
• See full diff in compare view

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