Add configuration value auto_php_version

We now support the new configuration option `auto_php_version`
(default: true) to automatically pass currenct PHP runtime version to
psalm via parameter `--php-version=`.
This helps to avoid issues like
vimeo/psalm#7026

src/psalm.php

@@ -28,6 +28,10 @@ public function describeConfiguration(PluginConfigurationBuilderInterface $confi
             ->withDefaultValue(false);
         $configOptionsBuilder
             ->describeStringOption('shepherd_host', 'Override shepherd host');
+        $configOptionsBuilder
+            ->describeBoolOption('auto_php_version', 'Automatically pass the current PHP version to psalm')
+            ->isRequired()
+            ->withDefaultValue(true);
 
         $configOptionsBuilder
             ->describeStringListOption(
@@ -67,6 +71,11 @@ private function buildArguments(
     ): array {
         $arguments = [];
 
+        if ($config->getBool('auto_php_version')) {
+            $arguments[] = '--php-version=' .
+                implode('.', array_slice(explode('.', PHP_VERSION), 0, 3));
+        }
+
         foreach (['debug', 'debug_by_line'] as $flag) {
             if ($config->getBool($flag)) {
                 $arguments[] = '--' .  str_replace('_', '-', $flag);