Upgrade dependencies

[medikoo]

Upgrade

• dotenv to v10. It's confirmed to not have breaking changes: Semver compliancy motdotla/dotenv#541
• sinon to v11. Breaking change seems only related to timers, which we do not use: https://github.com/sinonjs/sinon/blob/master/CHANGELOG.md#1100--2021-05-24

[codecov]

Codecov Report

Merging #9569 (9517056) into master (8dbb56e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9569   +/-   ##
=======================================
  Coverage   86.57%   86.57%           
=======================================
  Files         322      322           
  Lines       12110    12110           
=======================================
  Hits        10484    10484           
  Misses       1626     1626           

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[pgrzesik]

Great call 👍