Update cf-xarray requirement from <=0.8.0,>=0.7.5 to >=0.7.5,<=0.8.9

[dependabot[bot]]

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[Zeitsperre]

@dependabot ignore this minor version

[dependabot[bot]]

OK, I won't notify you about version 0.8.x again, unless you re-open this PR.

[coveralls]

Pull Request Test Coverage Report for Build 7890160712

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall first build on dependabot/pip/cf-xarray-gte-0.7.5-and-lte-0.8.9 at 72.656%

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Totals
Change from base Build 7890154148:	72.7%
Covered Lines:	1767
Relevant Lines:	2432

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💛 - Coveralls