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Replace icecream-truck map entry with ictr. #455

Job	Run time
initialize / define-constants	2s
test / lint-and-build	38s
test / test-coverage (ubuntu-latest, 3.15)	59s
test / test-coverage (ubuntu-latest, 3.13)	47s
test / test-coverage (macos-latest, 3.12)	56s
test / test-coverage (windows-latest, 3.12)	2m 9s
test / test-coverage (macos-latest, 3.14)	40s
test / test-coverage (ubuntu-latest, 3.14)	52s
test / test-coverage (macos-latest, 3.15)	1m 54s
test / test-coverage (windows-latest, 3.15)	2m 20s
test / test-coverage (windows-latest, 3.14)	1m 42s
test / test-coverage (macos-latest, 3.13)	49s
test / test-coverage (ubuntu-latest, 3.12)	48s
test / test-coverage (windows-latest, 3.13)	1m 51s
report / report-coverage	32s
	16m 59s