Update dependency @google-cloud/datastore to v5

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
@google-cloud/datastore	dependencies	major	^4.1.1 -> ^5.0.0

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Release Notes

googleapis/nodejs-datastore

v5.0.0

Compare Source

⚠ BREAKING CHANGES

• keyToLegacyUrlsafe is now an async method (#​496)
• throw error with out of bounds integer values, optionally wrap into DsInt or provide a custom 'integerValue' type cast options #​516

Features

• throw error with out of bounds integer values, optionally wrap into DsInt or provide a custom 'integerValue' type cast options #​516 (6c8cc74)

Bug Fixes

• docs: snippets are now replaced in jsdoc comments (#​535) (53ddc21)
• keyToLegacyUrlsafe is now an async method (#​496) (bbd1ebe)

4.5.2 (2019-11-08)

Bug Fixes

• deps: update dependency @​grpc/grpc-js to v0.6.11 (#​532) (95cded0)

4.5.1 (2019-11-07)

Bug Fixes

• deps: update dependency @​grpc/grpc-js to v0.6.10 (#​527) (beb3bcc)

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