Calendar Updates
* XSES: Add 2023-09-01 (Polling Day) as a public holiday (321) philiptromans
* XBOM: Bakri Eid changed to 2023-06-29 (316) ericngqrt
Enhancements
* Add XNAS calendar alias (318) mzjp2
Maintenance
* Update and fixes for pandas 2.1.0 (327) maread99
* Update dependencies (327) maread99
* Advance Minimum Python version to 3.9 (323) maread99
* Advance Maximum Python version to 3.11 (323) maread99