MAINT: Mark test_open_dataset as flaky (#2625) #2586

Job	Run time
should run ci	15s
GHA Security Analysis using Zizmor	16s
cache-pixi-lock	8s
build-and-upload-nightly-parcels	2m 32s
Flaky unit tests: ubuntu \| pixi run -e test tests -m 'flaky'	4m 16s
TypeChecking: pixi run typing	2m 2s
Unit tests: ubuntu \| pixi run -e test-py311 tests	7m 28s
Unit tests: ubuntu \| pixi run -e test-py313 tests	7m 30s
Unit tests: windows \| pixi run -e test tests	12m 38s
Unit tests: ubuntu \| pixi run -e test tests	5m 52s
Unit tests: ubuntu \| pixi run -e test-minimum tests	9m 50s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	-1s
merge-test-artifacts	0s
	52m 46s

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