Fix for deprecated dynamic properties in php 8.2.2

[fr3nch13]

Error: Creation of dynamic property josegonzalez\Dotenv\Expect::$environment is deprecated on line 14 of vendor/josegonzalez/dotenv/src/josegonzalez/Dotenv/Expect.php

[fr3nch13]

This is passing all tests for php 5.x, 7.x, and 8.x
Coverage isn't working for php 7.1, but that's due to an internal issue with phpunit.
https://github.com/302dev/php-dotenv/actions/runs/4198159661

[fr3nch13]

PR #54 Fixes this issue and updates the CI workflow.

[fr3nch13]

See PR #55

[josegonzalez]

Closing as that was merged. Thanks for the PR!