Remove aligator/gar/fwd.hpp #49

Job	Run time
ubuntu-latest - Env all Release	9m 30s
ubuntu-latest - Env all Debug	11m 25s
ubuntu-latest - Env all-py39 Release	50s
ubuntu-latest - Env all-py39 Debug	20m 33s
macos-latest - Env all Release	5m 38s
macos-latest - Env all Debug	3m 23s
macos-latest - Env all-py39 Release	1m 11s
macos-latest - Env all-py39 Debug	9m 17s
macos-13 - Env all Release	3m 18s
macos-13 - Env all Debug	15m 43s
macos-13 - Env all-py39 Release	10m 42s
macos-13 - Env all-py39 Debug	11m 39s
check-macos-linux-pixi	1s
	1h 43m 10s

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