Update Pyomo requirement to the 6.9.0 release #12013

Job	Run time
(util) Check if should run	5s
Run tests from site-packages (non-editable) installation (pip-default/linux)	29m 25s
pytest (py3.9/linux/integration)	25m 37s
Run examples (py3.9/linux)	16m 51s
Run tests from site-packages (non-editable) installation (pip-complete/linux)	30m 1s
Run examples (py3.9/win64)	27m 28s
pytest (py3.9/win64/integration)	40m 15s
Run tests from site-packages (non-editable) installation (pip-all/linux)	30m 51s
Run examples (py3.10/linux)	16m 36s
pytest (py3.10/linux/integration)	22m 11s
Run tests from site-packages (non-editable) installation (conda-like/linux)	29m 37s
pytest (py3.10/win64/integration)	44m 12s
Run examples (py3.10/win64)	31m 31s
pytest (py3.11/linux/integration)	20m 31s
Run examples (py3.11/linux)	31s
Run examples (py3.11/win64)	30m 27s
pytest (py3.11/win64/integration)	40m 27s
Run examples (py3.12/linux)	15m 16s
pytest (py3.12/linux/integration)	19m 39s
Run examples (py3.12/win64)	25m 16s
pytest (py3.12/win64/integration)	37m 57s
	8h 54m 44s

Provide feedback