prepare feature release 2.1.0

Author: llaville

.changes/2.x/2.1.0.md

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+
+## 2.1.0 - 2025-04-13
+
+### Added
+
+- support for Psalm 6.x
+- support for PHPUnit 12.x
+
+### Changed
+
+- upgrade [docker-php-extension-installer](https://github.com/mlocati/docker-php-extension-installer) to version 2.7.31
+- upgrade phpDocumentor tool versions
+- update PHPLint v9.x versions supported
+
+### Removed
+
+- drop support for PHPUnit 4.x, 5.x, 6.x, 7.x that reached end of life
+- drop support of PHP-CS-Fixer 2.x
+- drop support of PHP_CodeSniffer 2.x
+- drop support of pip v2
+- drop support of PHP Magic Number Detector v2
+- drop support of Deployer v2, v3, v4, v5 and upgrade support to latest version 7.5.12
+
+**Full Changelog**: [2.0.0...2.1.0](https://github.com/llaville/docker-php-toolbox/compare/2.0.0...2.1.0)