Update CONTRIBUTING.md with new steps (#64) #7639

Job	Run time
sync-labels (ProjectPythia/.github)	21s
sync-labels (ProjectPythia/actions)	22s
sync-labels (ProjectPythia/projectpythia.github.io)	20s
sync-labels (ProjectPythia/pythia-foundations)	21s
sync-labels (ProjectPythia/pythia-datasets)	22s
sync-labels (ProjectPythia/sphinx-pythia-theme)	22s
sync-labels (ProjectPythia/cmip6-cookbook)	23s
sync-labels (ProjectPythia/cookbook-template)	19s
sync-labels (ProjectPythia/HRRR-AWS-cookbook)	20s
sync-labels (ProjectPythia/dask-cookbook)	19s
sync-labels (ProjectPythia/landsat-ml-cookbook)	19s
sync-labels (ProjectPythia/cookbook-actions)	22s
sync-labels (ProjectPythia/cookbook-gallery)	22s
sync-labels (ProjectPythia/github-sandbox)	20s
sync-labels (ProjectPythia/pythia-cookoff-2023)	22s
sync-labels (ProjectPythia/metpy-cookbook)	25s
sync-labels (ProjectPythia/gridding-cookbook)	22s
sync-labels (ProjectPythia/cesm-lens-aws-cookbook)	19s
sync-labels (ProjectPythia/radar-cookbook)	20s
sync-labels (ProjectPythia/xbatcher-ML-1-cookbook)	19s
sync-labels (ProjectPythia/kerchunk-cookbook)	20s
sync-labels (ProjectPythia/packaging-cookbook)	19s
sync-labels (ProjectPythia/librarynb)	20s
sync-labels (ProjectPythia/physical-oceanography-cookbook)	20s
sync-labels (ProjectPythia/intake-cookbook)	20s
sync-labels (ProjectPythia/xgcm-cookbook)	18s
	8m 56s

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