fix: revert ExpressionProperties to Properties in BaseDataSource

ExpressionProperties is used for a specific property to avoid unexpected behaviors for already existing properties (e.g. passwords with ${...})

pgjdbc/src/main/java/org/postgresql/ds/common/BaseDataSource.java

@@ -50,7 +50,7 @@
   private int portNumber = 0;
 
   // Map for all other properties
-  private Properties properties = new ExpressionProperties();
+  private Properties properties = new Properties();
 
   /**
    * Gets a connection to the PostgreSQL database. The database is identified by the DataSource