Bump Django to 4.2.26 to agree with DAB changes #12699

Job	Run time
api-test	11m 18s
dev-env	14m 5s
api-migrations	15m 39s
api-lint	4m 56s
awx-operator	12m 31s
awx_collection sanity (stable-2.17)	1m 34s
awx_collection integration (a-h, ^[a-h])	15m 20s
awx_collection integration (i-p, ^[i-p])	18m 27s
awx_collection integration (r-z0-9, ^[r-z0-9])	17m 47s
awx-collection	5m 45s
combine awx_collection integration coverage	31s
	1h 57m 53s

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