Fixed Django 6 support #183

Job	Run time
tests_node	18s
Test on Python 3.10 and Django 5.0 on postgres	59s
Test on Python 3.9 and Django 4.2 on postgres	1m 9s
Test on Python 3.10 and Django 4.2 on postgres	59s
Test on Python 3.11 and Django 4.2 on postgres	1m 16s
Test on Python 3.12 and Django 5.0 on postgres	1m 1s
Test on Python 3.10 and Django 5.1 on postgres	1m 11s
Test on Python 3.11 and Django 5.0 on postgres	1m 2s
Test on Python 3.10 and Django 5.2 on postgres	1m 10s
Test on Python 3.13 and Django 5.1 on postgres	1m 10s
Test on Python 3.11 and Django 5.1 on postgres	1m 19s
Test on Python 3.13 and Django 5.2 on postgres	1m 12s
Test on Python 3.9 and Django 4.2 on sqlite	1m 3s
Test on Python 3.12 and Django 5.2 on postgres	1m 18s
Test on Python 3.12 and Django 4.2 on postgres	1m 5s
Test on Python 3.12 and Django 5.1 on postgres	1m 24s
Test on Python 3.11 and Django 5.2 on postgres	1m 10s
	18m 46s

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