Bumps `react-router-dom` to v6 #1970

Job	Run time
Cancel redundant actions already in progress	2s
Build Wasp (ubuntu-20.04, latest, 8.10.7, 3.6.2.0)	11m 46s
Build Wasp (macos-latest, latest, 8.10.7, 3.6.2.0)	19m 43s
Build Wasp (windows-latest, latest, 8.10.7, 3.6.2.0)	8m 19s
Build Wasp (ubuntu-20.04, 18, 8.10.7, 3.6.2.0)	9m 47s
Build Wasp (ubuntu-20.04, 20, 8.10.7, 3.6.2.0)	10m 21s
	59m 58s

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