Bump environs from 8.1.0 to 9.5.0

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.

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.

9.3.5 (2021-11-14)

Bug fixes:

• Fix env.url and other parsers that take field keyword arguments (#227). Thanks KochankovID for the PR.

9.3.4 (2021-10-03)

Bug fixes:

• Allow default for env.path to be a pathlib.Path (#228). Thanks KochankovID for the PR.

9.3.3 (2021-08-08)

Bug fixes:

• Fix compatibility with marshmallow>=3.13.0 so that no DeprecationWarnings are raised (#224).

9.3.2 (2021-03-28)

Bug fixes:

• Handle JSON decoding errors when using env.json (#212). Thanks bvanelli for the PR.

9.3.1 (2021-02-07)

Bug fixes:

• Apply variable expansion to default values (#204).

... (truncated)

• 74e0edb Bump version and update changelog
• 9199ab5 Add support for custom functions on subcast. (#241)
• 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)
• 752b11f Bump version and update changelog
• 9bc130a fix bug with ma field creation (#236)
• 3609946 Bump flake8 from 3.9.2 to 4.0.1 (#234)
• f4a2715 Bump flake8-bugbear from 21.4.3 to 21.9.2 (#230)
• 36aa3ea Fix version number in CHANGELOG.md (#232)
• Additional commits viewable in compare view

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