Upgrade framework

vendor/psy/psysh/src/EnvInterface.php

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+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2022 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy;
+
+/**
+ * Abstraction around environment variables.
+ */
+interface EnvInterface
+{
+    /**
+     * Get an environment variable by name.
+     *
+     * @return string|null
+     */
+    public function get(string $key);
+}