fix: upgrade date-fns from 3.3.1 to 3.6.0 #9958

Job	Run time
👀 / validaation_muutoshistoria.md check	11s
👀 / Database documentation check	12s
👀 / tiedonsiirtoprotokollan_muutoshistoria.md check	11s
👀 / Lint Koski	1m 43s
👀 / Backend (api misc 1/2)	8m 14s
👀 / Backend (api misc 2/2)	11m 9s
👀 / Backend (api oppijavalidation)	11m 19s
👀 / Backend (non-mock)	6m 53s
👀 / Backend (other 1/4)	10m 19s
👀 / Backend (other 2/4)	13m 58s
👀 / Backend (other 4/4)	11m 39s
👀 / Backend (other 3/4)	10m 51s
👀 / Playwright 1/5	15m 2s
👀 / Playwright 2/5	10m 6s
👀 / Frontend unit tests	36s
👀 / Frontend 1/7	12m 17s
👀 / Playwright 3/5	10m 18s
👀 / Frontend 2/7	9m 21s
👀 / Valpas lint & unit	59s
👀 / Playwright 4/5	10m 4s
👀 / Frontend 3/7	10m 37s
👀 / Playwright 5/5	10m 50s
👀 / Valpas 1/6	13m 17s
👀 / Frontend 4/7	8m 48s
👀 / Valpas 2/6	9m 51s
👀 / Frontend 5/7	12m 22s
👀 / Valpas 3/6	13m 27s
👀 / Frontend 6/7	9m 22s
👀 / Valpas 4/6	11m 41s
👀 / Frontend 7/7	8m 27s
👀 / Valpas 5/6	9m 44s
👀 / Valpas 6/6	9m 32s
	4h 43m 20s

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