Update dependency google-cloud-core to v1.7.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-cloud-core	==1.4.1 -> ==1.7.3

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Release Notes

googleapis/python-cloud-core (google-cloud-core)

v1.7.3

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Bug Fixes

• deps: allow google-api-core < 3.0.0 on v1 branch (#​204) (43310f8)

v1.7.2

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Documentation

• add Samples section to CONTRIBUTING.rst (#​119) (5c3959b)

v1.7.1

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Bug Fixes

• pass kwargs through in 'from_service_account_json' (#​109) (efc4bbf)

v1.7.0

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Features

• add 'Client.close' (#​100) (7387fc8)
• add 'Client.from_service_account_info' factory (#​54) (7e59360)

Documentation

• update python contributing guide (#​80) (58deef8)

v1.6.0

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Features

• add mtls support (#​75) (a93129b)
• infer project from explicit service account creds (#​51) (2bd41a1), closes #​27

Documentation

• python: document adding Python 3.9 support, dropping 3.5 support (#​65) (860f345), closes #​787

v1.5.0

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Features

• add support for Python 3.9, drop support for Python 3.5 (#​55) (ddf7ce5)

v1.4.4

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Dependencies

• require six>=1.12.0 and google-api-core>=1.21.0 (#​46) (a97b9ca)

v1.4.3

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Bug Fixes

• avoid using 'pkg_resources' to determine version (#​40) (568578d), closes #​39

v1.4.2

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Bug Fixes

• handle query_params tuples in JSONConnection.build_api_url (#​34) (6a9adb3)

Performance Improvements

• use prettyPrint=false by default (#​28) (c407b5d)

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