min php version bumped, phpunit and phploc libs updated for versions compatible with php 8

Author: fideloper

composer.json

@@ -15,14 +15,14 @@
         "source": "https://github.com/onelogin/php-saml/"
     },
     "require": {
-        "php": ">=5.4",
+        "php": ">=7.0",
         "robrichards/xmlseclibs": ">=3.1.1",
-        "phpunit/phpunit": "<7.5.18"
+        "phpunit/phpunit": "7.5.17 || ^9.5"
     },
     "require-dev": {
         "php-coveralls/php-coveralls": "^1.0.2 || ^2.0",
         "sebastian/phpcpd": "^2.0 || ^3.0 || ^4.0",
-        "phploc/phploc": "^2.1 || ^3.0 || ^4.0",
+        "phploc/phploc": "^2.1 || ^3.0 || ^4.0 || ^7.0",
         "pdepend/pdepend": "^2.5.0",
         "squizlabs/php_codesniffer": "^3.1.1"
     },