Bump django-compressor from 4.0 to 4.4 #884

Job	Run time
build (mysql, 3.6)	1h 45m 50s
build (mysql, 3.11)	2h 25m 44s
build (postgres, 3.6)	1h 26m 10s
build (postgres, 3.11)	2h 7m 13s
build (sqlite3, 3.6)	1h 32m 15s
build (sqlite3, 3.11)	1h 56m 59s
Indicate completion to coveralls	14s
	11h 14m 25s

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