Patch missing backstop (#77) #319

Job	Run time
formatting quality	5s
minimal tests	2m 6s
ActivitySim 2-Zone Example (SANDAG)	57m 12s
ActivitySim 1-Zone Example (MTC)	47m 48s
ubuntu-latest py3.11	2m 52s
ubuntu-latest py3.10	3m 6s
ubuntu-latest py3.12	3m 0s
windows-latest py3.10	4m 20s
ubuntu-latest py3.13	2m 58s
windows-latest py3.13	4m 12s
windows-latest py3.11	4m 17s
windows-latest py3.12	4m 12s
deploy-docs	0s
	2h 16m 8s

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