fix for pandas 2 #943

Job	Run time
linux-64-py	5m 34s
win-64	5m 58s
Estimation Mode Unit Tests	7m 53s
macOS	3m 23s
random_seed_generation_test	3m 11s
prototype_mtc	48m 47s
prototype_marin	1m 42s
placeholder_psrc	47m 50s
placeholder_sandag	2h 26m 2s
prototype_mwcog	49m 13s
placeholder_multiple_zone	10m 17s
prototype_sandag_xborder	5m 27s
production_semcog	6m 20s
prototype_mtc_extended	1h 22m 2s
Standard 2-Zone Example (SANDAG)	1h 12m 26s
Standard 1-Zone Example (MTC)	44m 56s
develop-docbuild	0s
	9h 1m 1s

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