Bump PHPUnit and use vendor-based namespace schemata for PHPCS and PHPUnit

Author: noplanman

composer.json

@@ -38,7 +38,7 @@
         "guzzlehttp/guzzle": "^6.0|^7.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.4",
+        "phpunit/phpunit": "^9.5",
         "squizlabs/php_codesniffer": "^3.5",
         "dms/phpunit-arraysubset-asserts": "^0.2",
         "monolog/monolog": "^2.1"

composer.lock

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://raw.githubusercontent.com/squizlabs/PHP_CodeSniffer/3.5.8/phpcs.xsd">
+<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="./vendor/squizlabs/php_codesniffer/phpcs.xsd">
     <description>PHP Code Sniffer</description>
 
     <arg value="snp"/>

phpcs.xml.dist

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.4/phpunit.xsd">
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd">
     <coverage>
         <include>
             <directory suffix=".php">./src</directory>