Support Django 5.2 and Python 3.13, drop Python 3.8 #149

Job	Run time
tests_node	11s
Test on Python 3.9 and Django 4.2 on postgres	58s
Test on Python 3.10 and Django 4.2 on postgres	1m 7s
Test on Python 3.11 and Django 4.2 on postgres	1m 1s
Test on Python 3.12 and Django 4.2 on postgres	1m 14s
Test on Python 3.13 and Django 4.2 on postgres	1m 10s
Test on Python 3.10 and Django 5.0 on postgres	1m 5s
Test on Python 3.11 and Django 5.0 on postgres	1m 3s
Test on Python 3.12 and Django 5.0 on postgres	1m 11s
Test on Python 3.10 and Django 5.1 on postgres	1m 12s
Test on Python 3.11 and Django 5.1 on postgres	57s
Test on Python 3.12 and Django 5.1 on postgres	1m 14s
Test on Python 3.13 and Django 5.1 on postgres	1m 13s
Test on Python 3.10 and Django 5.2 on postgres	1m 7s
Test on Python 3.11 and Django 5.2 on postgres	1m 0s
Test on Python 3.12 and Django 5.2 on postgres	1m 2s
Test on Python 3.13 and Django 5.2 on postgres	58s
Test on Python 3.9 and Django 4.2 on sqlite	1m 16s
	18m 59s

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