fix: reinit! on forwarddiff cache #272

Job	Run time
downgrade (1.10, core)	16m 28s
downgrade (1.10, downstream)	8m 41s
downgrade (1.10, wrappers)	10m 11s
test (core, 1.10, ubuntu-latest)	16m 24s
test (core, 1.10, macos-latest)	12m 30s
test (core, 1.10, windows-latest)	25m 47s
test (core, 1, ubuntu-latest)	27m 55s
test (core, 1, macos-latest)	18m 45s
test (core, 1, windows-latest)	42m 13s
test (downstream, 1.10, ubuntu-latest)	7m 57s
test (downstream, 1.10, macos-latest)	6m 26s
test (downstream, 1.10, windows-latest)	11m 26s
test (downstream, 1, ubuntu-latest)	17m 13s
test (downstream, 1, macos-latest)	9m 37s
test (downstream, 1, windows-latest)	20m 8s
test (wrappers, 1.10, ubuntu-latest)	10m 6s
test (wrappers, 1.10, macos-latest)	6m 48s
test (wrappers, 1.10, windows-latest)	12m 10s
test (wrappers, 1, ubuntu-latest)	20m 40s
test (wrappers, 1, macos-latest)	18m 52s
test (wrappers, 1, windows-latest)	22m 49s
	5h 43m 6s

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