add dependency on earthkit-meteo #781

Job	Run time
Check versions and tags	0s
Code QA	13s
Download test data	7s
Tests notebooks Python ${{ matrix.python-version }} ${{ matrix.platform }}	0s
Long tests with external downloads Python ${{ matrix.python-version }} ${{ matrix.platform }}	0s
Short tests Python 3.8 ubuntu-latest	1m 40s
Short tests Python 3.9 ubuntu-latest	1m 38s
Short tests Python 3.10 ubuntu-latest	1m 36s
Short tests Python 3.8 macos-latest	2m 6s
Short tests Python 3.9 macos-latest	4m 23s
Short tests Python 3.10 macos-latest	1m 58s
Short tests Python 3.8 windows-latest	2m 58s
Short tests Python 3.9 windows-latest	3m 14s
Short tests Python 3.10 windows-latest	3m 15s
Upload to Pypi and release	0s
	23m 8s

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