chore(deps): update dependency google-cloud-errors to "~> 1.6.0" (#232) #2491

Job	Run time
CI (ubuntu-latest, 3.3, --test)	1m 11s
CI (windows-latest, 4.0, --test)	2m 39s
CI (macos-latest, 4.0, --test)	1m 13s
CI (ubuntu-latest, 4.0, --rubocop --build --yard --linkinator)	1m 6s
CI (ubuntu-latest, 3.2, --test)	1m 13s
CI (ubuntu-latest, 4.0, --test)	59s
CI (ubuntu-latest, 3.4, --test)	1m 13s
	9m 34s

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