Make `py-triangle` a tutorial dependency (#2581) #2488

Job	Run time
should run ci	7s
GHA Security Analysis using Zizmor	14s
cache-pixi-lock	1m 9s
TypeChecking: pixi run typing	1m 27s
build-and-upload-nightly-parcels	2m 57s
Unit tests: windows \| pixi run -e test tests	17m 26s
Unit tests: ubuntu \| pixi run -e test-py311 tests	9m 29s
Unit tests: ubuntu \| pixi run -e test-minimum tests	9m 38s
Unit tests: ubuntu \| pixi run -e test-py313 tests	9m 59s
Unit tests: ubuntu \| pixi run -e test tests	8m 47s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	1h 1m 13s

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