[securemail] Upgrade singpolyma/openpgp to version 0.6.0

- Add missing use statement in SecureTestEmail
- Address https://github.com/friendica/friendica/issues/12011#issuecomment-1321196332
- phpseclib version 3 dependency is implied from the core so it is removed from the addon

securemail/vendor/singpolyma/openpgp-php/tests/phpseclib_suite.php

@@ -64,8 +64,19 @@ class KeyVerification extends TestCase {
   }
 }
 
+abstract class LibTestCase extends TestCase {
+  public function assertCast5Support() {
+    if(in_array('mcrypt', get_loaded_extensions())) {
+       return;
+    }
+    if(in_array('cast5-cfb', openssl_get_cipher_methods()) || in_array('CAST5-CFB', openssl_get_cipher_methods())) {
+      return;
+    }
+    $this->markTestSkipped('Not supported');
+  }
+}
 
-class Decryption extends TestCase {
+class Decryption extends LibTestCase {
   public function oneSymmetric($pass, $cnt, $path) {
     $m = OpenPGP_Message::parse(file_get_contents(dirname(__FILE__) . '/data/' . $path));
     $m2 = OpenPGP_Crypt_Symmetric::decryptSymmetric($pass, $m);
@@ -82,6 +93,7 @@ class Decryption extends TestCase {
   }
 
   public function testDecryptCAST5() { // Requires mcrypt or openssl
+    $this->assertCast5Support();
     $this->oneSymmetric("hello", "PGP\n", "symmetric-cast5.gpg");
   }
 
@@ -159,7 +171,7 @@ class Decryption extends TestCase {
   }
 }
 
-class Encryption extends TestCase {
+class Encryption extends LibTestCase {
   public function oneSymmetric($algorithm) {
     $data = new OpenPGP_LiteralDataPacket('This is text.', array('format' => 'u', 'filename' => 'stuff.txt'));
     $encrypted = OpenPGP_Crypt_Symmetric::encrypt('secret', new OpenPGP_Message(array($data)), $algorithm);
@@ -173,6 +185,7 @@ class Encryption extends TestCase {
   }
 
   public function testEncryptSymmetricCAST5() {
+    $this->assertCast5Support();
     $this->oneSymmetric(3);
   }