build

Remove `third_party_dev.txt` deps (already referenced in `edc.txt`) #246

Job	Run time
build (Python 3.12, Django 5.1, mysql)	3m 10s
build (Python 3.12, Django 5.1, postgres)	3m 8s
build (Python 3.12, Django dev, mysql)	3m 2s
build (Python 3.12, Django dev, postgres)	2m 55s
build (Python 3.13, Django 5.1, mysql)	2m 55s
build (Python 3.13, Django 5.1, postgres)	2m 54s
build (Python 3.13, Django dev, mysql)	3m 20s
build (Python 3.13, Django dev, postgres)	3m 22s
	24m 46s

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