Update vlucas/phpdotenv requirement from ^3.4.0 to ^4.2.2

[dependabot[bot]]

Updates the requirements on vlucas/phpdotenv to permit the latest version.

Release notes

Sourced from vlucas/phpdotenv's releases.

V4.2.2 (12/12/2021)

We announce the immediate availability V4.2.2.

Bug Fixes

• Updated author homepages (2e93cc98e2e8e869f8d9cfa61bb3a99ba4fc4141)
• PHP 8.1 compatibility fixes (5b547cdb25825f10251370f57ba5d9d924e6f68e)

Commits

• 77e9746 Upgraded static analyzers
• d96be01 Merge branch '3.6' into 4.2
• 5b547cd PHP 8.1 compatibility fixes
• b710903 Merge branch '2.6' into 3.6
• 2e93cc9 Update composer.json
• d38f4d1 Upgraded static analyzers
• 6854d24 Merge branch '3.6' into 4.2
• a1bf4c9 Fix for PHPUnit 8 compatibility
• 51a8a7b Merge branch '2.6' into 3.6
• f1e2a35 Added support for PHP 8.1 (#496)
• Additional commits viewable in compare view

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