Update vlucas/phpdotenv requirement from ^3.4.0 to ^4.2.0

[dependabot-preview[bot]]

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

Release notes

Sourced from vlucas/phpdotenv's releases.

V4.2.0 (20/01/2021)

We announce the immediate availability V4.2.0.

New Features

• Backported Dotenv::createArrayBacked() and Dotenv::parse() (b56a06737822956e1d408304315946f50fa39bc5)

Bug Fixes

• Reject env files with missmatched quotes (e9a36be8898e927403d42409e1401020fab0e6a2)

Commits

• da64796 Updated static analyzers
• d009f2e Merge branch '3.6' into 4.2
• 5e679f7 Merge branch '2.6' into 3.6
• b786088 Revert "Test on PHP 8.1 too (#467)"
• e9a36be Merge branch '3.6' into 4.2
• 04e416a Merge branch '2.6' into 3.6
• 7417448 Reject env files with missmatched quotes
• b56a067 Backport Dotenv::parse()
• c1e1038 Upgraded static analyzers
• 4580418 Merge branch '3.6' into 4.1
• Additional commits viewable in compare view

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