Use Version::id() instead of Version::series() to check extension compatibility

Version::id() returns X.Y.Z for release versions, which can be passed
directly to PharIo\Version\Version.

For unreleased versions, Version::id() returns X.Y.Z-n-hash (release
branch) or X.Y-hash (main branch), which cannot be passed directly to
PharIo\Version\Version.

X.Y.Z-n-hash is passed to PharIo\Version\Version as X.Y.Z and X.Y-hash
is passed to PharIo\Version\Version as X.Y.0.

Author: sebastianbergmann

src/Runner/Extension/PharLoader.php

@@ -9,7 +9,11 @@
  */
 namespace PHPUnit\Runner\Extension;
 
+use function count;
+use function explode;
+use function implode;
 use function is_file;
+use function strpos;
 use PharIo\Manifest\ApplicationName;
 use PharIo\Manifest\Exception as ManifestException;
 use PharIo\Manifest\ManifestLoader;
@@ -39,7 +43,7 @@ public function loadPharExtensionsInDirectory(string $directory): array
 
             try {
                 $applicationName = new ApplicationName('phpunit/phpunit');
-                $version         = new PharIoVersion(Version::series());
+                $version         = new PharIoVersion($this->phpunitVersion());
                 $manifest        = ManifestLoader::fromFile('phar://' . $file . '/manifest.xml');
 
                 if (!$manifest->isExtensionFor($applicationName)) {
@@ -74,4 +78,21 @@ public function loadPharExtensionsInDirectory(string $directory): array
             'notLoadedExtensions' => $notLoadedExtensions,
         ];
     }
+
+    private function phpunitVersion(): string
+    {
+        $version = Version::id();
+
+        if (strpos($version, '-') === false) {
+            return $version;
+        }
+
+        $parts = explode('.', explode('-', $version)[0]);
+
+        if (count($parts) === 2) {
+            $parts[] = 0;
+        }
+
+        return implode('.', $parts);
+    }
 }