build

Remove `third_party_dev.txt` deps (already referenced in `edc.txt`) #135

Job	Run time
build (Python 3.12, Django 5.1, mysql)	2m 20s
build (Python 3.12, Django 5.1, postgres)	2m 11s
build (Python 3.12, Django dev, mysql)	2m 31s
build (Python 3.12, Django dev, postgres)	2m 29s
build (Python 3.13, Django 5.1, mysql)	2m 52s
build (Python 3.13, Django 5.1, postgres)	2m 24s
build (Python 3.13, Django dev, mysql)	3m 10s
build (Python 3.13, Django dev, postgres)	3m 2s
	20m 59s

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