Update dependencies

[allieychen]

Beam has an update (2.13.0) and changes the dependencies on the version of google-cloud-core.

[coveralls]

Pull Request Test Coverage Report for Build 1729

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+1.3%) to 89.111%

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Files with Coverage Reduction	New Missed Lines	%
gcp_variant_transforms/beam_io/vcfio_test.py	2	98.69%
gcp_variant_transforms/beam_io/vcf_parser.py	2	85.95%

Totals
Change from base Build 1726:	1.3%
Covered Lines:	7128
Relevant Lines:	7999

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💛 - Coveralls