Tests

Update ForwardDiff compat #99

Job	Run time
Tests (1, Core) / Tests - Core	10m 23s
Tests (lts, Core) / Tests - Core	8m 41s
Tests (1, Downstream) / Tests - Downstream	15m 15s
Tests (lts, Downstream) / Tests - Downstream	9m 45s
Tests (pre, Core) / Tests - Core	10m 4s
Tests (pre, Downstream) / Tests - Downstream	15m 24s
	1h 9m 32s

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