Add support for SourceGuardian on PHP 8.1 (mlocati#639)

Author: mlocati

data/supported-extensions

@@ -93,7 +93,7 @@ soap 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2
 sockets 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2
 sodium 5.6 7.0 7.1
 solr 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0
-sourceguardian 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0
+sourceguardian 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 spx 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2
 sqlsrv 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2
 ssh2 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2