Add Symfony Deprecation Contracts package

- Created CHANGELOG.md to maintain version history.
- Added README.md with usage instructions for the trigger_deprecation() function.
- Initialized composer.json for the Symfony Deprecation Contracts library, specifying dependencies and autoloading.

modules/pshowsso/deps/patrickbussmann/oauth2-apple/test/ext/KeyDumpSigner5.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace League\OAuth2\Client\Test;
+
+use Lcobucci\JWT\Signature;
+use Lcobucci\JWT\Signer;
+
+final class KeyDumpSigner implements Signer
+{
+    public function getAlgorithmId()
+    {
+        return 'keydump';
+    }
+
+    public function modifyHeader(array &$headers)
+    {
+        $headers['alg'] = $this->getAlgorithmId();
+    }
+
+    public function verify($expected, $payload, $key)
+    {
+        return $expected === $key->contents();
+    }
+
+    public function sign($payload, $key)
+    {
+        return new Signature($key->contents());
+    }
+}