Remove python3.7 #498

Job	Run time
base (base, base)	5m 16s
images (all, all)	1h 1m 52s
images (python3.8, 3.8)	3m 9s
images (python3.9, 3.9)	3m 2s
images (python3.10, 3.10)	3m 47s
images (python3.11, 3.11)	4m 36s
images (python3.12, 3.12)	3m 3s
images (python3.13, 3.13)	4m 50s
images-pillow (pillow/3.8, 3.8-pillow)	14m 22s
images-pillow (pillow/3.9, 3.9-pillow)	13m 37s
images-pillow (pillow/3.10, 3.10-pillow)	12m 28s
images-pillow (pillow/3.11, 3.11-pillow)	16m 12s
images-pillow (pillow/3.12, 3.12-pillow)	13m 48s
images-pillow (pillow/3.13, 3.13-pillow)	13m 49s
images-pillow (pillow/all, all-pillow)	11m 44s
apps (ipython, ipython)	5m 34s
apps (pylama, pylama)	1m 46s
apps (pylava, pylava)	1m 54s
apps (certbot, certbot)	16m 22s
apps (black, black)	3m 47s
apps (gray, gray)	17m 39s
apps (ruff, ruff)	2m 36s
apps (jupyterlab, jupyterlab)	4m 48s
	4h 0m 1s

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