deps: update dependency environs to v15

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
environs (changelog)	<15 → <16

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Release Notes

sloria/environs (environs)

v15.0.1

Compare Source

Bug fixes:

• Exported environment variables take precedence over .env files (regression from 15.0.0) (#​464).
  Thanks DougEdey-Slice for reporting.

v15.0.0

Compare Source

Bug fixes:

• Exported environment variables take precedence over .env files (regression from 15.0.0) (#​464).
  Thanks DougEdey-Slice for reporting.

v14.6.0

Compare Source

Bug fixes:

• Fix variable expansion with other characters (#​359).
  Thanks flymanzhao for reporting and veeceey for the PR.

Other changes:

• Update lowest supported marshmallow version to 3.26.2 (#​448).
  Thanks whyscream for the PR.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.26%. Comparing base (ae79cc7) to head (2c1abd3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #209   +/-   ##
=======================================
  Coverage   97.26%   97.26%           
=======================================
  Files         104      104           
  Lines        4459     4459           
=======================================
  Hits         4337     4337           
  Misses        122      122           

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