Fix required Python version

Author: pcisar

docs/index.txt

@@ -12,7 +12,7 @@ This package provides modules for:
 - Processing Firebird server log.
 - Processing output from Firebird server trace & audit sessions.
 
-.. note:: Requires Python 3.8+
+.. note:: Requires Python 3.11+
 
 .. tip:: You can download docset for Dash_ (MacOS) or Zeal_ (Windows / Linux) documentation
    readers from releases_ at github.