Fix signature of fixed size arrays #6330

Job	Run time
tests (ubuntu-latest, 3.8, data_dependency)	30s
tests (ubuntu-latest, 3.8, erc)	33s
tests (ubuntu-latest, 3.8, printers)	1m 17s
tests (ubuntu-latest, 3.8, interface)	32s
tests (ubuntu-latest, 3.12, data_dependency)	27s
tests (ubuntu-latest, 3.12, find_paths)	32s
tests (ubuntu-latest, 3.12, erc)	27s
tests (ubuntu-latest, 3.8, slither_config)	35s
tests (ubuntu-latest, 3.12, path_filtering)	29s
tests (ubuntu-latest, 3.12, slither_config)	27s
tests (ubuntu-latest, 3.8, find_paths)	32s
tests (ubuntu-latest, 3.8, upgradability)	47s
tests (ubuntu-latest, 3.12, interface)	31s
tests (ubuntu-latest, 3.12, printers)	1m 3s
tests (ubuntu-latest, 3.12, flat)	27s
tests (ubuntu-latest, 3.8, path_filtering)	29s
tests (ubuntu-latest, 3.12, upgradability)	46s
tests (ubuntu-latest, 3.8, flat)	28s
	10m 52s

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