add debugging for unknown itemtype #1207

Job	Run time
skip_check	8s
type_check (3.8)	25s
type_check (3.9)	26s
get_version	4s
lint (3.8)	23s
type_check (3.10)	31s
type_check (3.11)	25s
lint (3.9)	24s
type_check (3.12)	30s
lint (3.10)	23s
lint (3.11)	27s
lint (3.12)	23s
patch_version / patch_version	7s
extract_changelog / extract_changelog	4s
test_non_linux (3.12, macos-12)	50s
test_non_linux (3.12, macos-13)	50s
test (3.8)	44s
test_non_linux (3.12, macos-14)	29s
test (3.9)	49s
test (3.10)	55s
test_non_linux (3.12, windows-2019)	1m 22s
test (3.11)	1m 22s
test_non_linux (3.12, windows-2022)	1m 3s
test (3.12)	54s
	13m 58s

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