Daemon 1.9.40 released

• Improvement: Add support for net.in and net.out annotations on PDO and MySQLi spans.
• Improvement: Add support for the new mysql.index_usage annotation on PDO and MySQLi spans.
• Improvement: Add support for the new session.save_handler.user_class annotation on Session spans.
• Improvement: Improve clarity of the anonymized SQL for redacted subselects acting as a table.
• Bugfix: Decimal numbers with leading decimal point now correctly consider the decimal point to be part of the number. Previously a query like SELECT foo + .1 was reported as SELECT foo + .?.
• Change: Update dependencies and rebuild with current Golang version.