Update dependency google-cloud-datastore to v2.9.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-cloud-datastore	==2.6.0 -> ==2.9.0

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Release Notes

googleapis/python-datastore

v2.9.0

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Features

• Add datastore aggregation query APIs (#​306) (96d98e5)

Bug Fixes

• deps: Allow protobuf 3.19.5 (#​372) (9305154)

v2.8.3

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Bug Fixes

• deps: Allow protobuf 3.19.5 (#​372) (9305154)

v2.8.2

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Bug Fixes

• deps: Require protobuf >= 3.20.2 (#​365) (4e3e81f)

v2.8.1

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Bug Fixes

• deps: allow protobuf < 5.0.0 (#​347) (de13860)
• deps: require proto-plus >= 1.22.0 (de13860)

Documentation

• Move the schedule_export samples from python-docs-samples (#​344) (2174800)
• samples: Add an example of using read_time in queries and get() (#​342) (ffc5f17)

v2.8.0

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Features

• Add read_time support for get and query (#​334) (58b4b74)

v2.7.2

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Bug Fixes

• require python 3.7+ (#​332) (a9c513f)

v2.7.1

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Documentation

• samples: add samples for IN, NOT_IN, and != operators. (#​312) (4170325)

v2.7.0

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Features

• support IN/NOT_IN/NOT_EQUAL operators (#​287) (465bd87)

v2.6.2

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Bug Fixes

• deps: require protobuf <4.0.0dev (#​318) (1dccd37)

Documentation

• fix changelog header to consistent size (#​319) (d3e9304)

v2.6.1

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Bug Fixes

• regenerate pb2 file with grpcio-tools (#​314) (0412cd5)

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