RS-31: Add Bucket.update and Bucket.update_batch method for changing labels #386

Job	Run time
format	11s
build	11s
pylint	26s
run_examples	24s
test (3.8, latest)	16s
test (3.8, latest, /workdir/lic.key)	16s
test (3.8, latest, ACCESS_TOKEN)	21s
test (3.8, latest, ACCESS_TOKEN, /workdir/lic.key)	21s
test (3.8, main)	22s
test (3.8, main, /workdir/lic.key)	21s
test (3.8, main, ACCESS_TOKEN)	22s
test (3.8, main, ACCESS_TOKEN, /workdir/lic.key)	19s
Upload if release	0s
	3m 50s

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