build(deps): Bump base64 from 0.21.4 to 0.21.5 #2303

Job	Run time
build-binaries (1.64)	5m 42s
docs	1m 10s
build-binaries (stable)	1m 12s
build-crate (--no-default-features, 1.64)	10m 20s
build-crate (--no-default-features, stable)	2m 51s
build-crate (--all-features, 1.64)	8m 13s
build-crate (--all-features, stable)	4m 18s
build-crate (--features=default, 1.64)	9m 33s
build-crate (--features=default, stable)	2m 52s
build-crate (--features=test-util, 1.64)	7m 58s
build-crate (--features=test-util, stable)	4m 10s
build-crate (--features=multithreaded, 1.64)	10m 9s
build-crate (--features=multithreaded, stable)	3m 22s
build-crate (--features=test-util,multithreaded, 1.64)	10m 4s
build-crate (--features=test-util,multithreaded, stable)	3m 16s
build-crate (--features=prio2, 1.64)	9m 54s
build-crate (--features=prio2, stable)	4m 31s
build-crate (--features=prio2,test-util, 1.64)	9m 26s
build-crate (--features=prio2,test-util, stable)	3m 18s
build-crate (--features=prio2,multithreaded, 1.64)	8m 32s
build-crate (--features=prio2,multithreaded, stable)	3m 56s
build-crate (--features=prio2,test-util,multithreaded, 1.64)	8m 31s
build-crate (--features=prio2,test-util,multithreaded, stable)	4m 40s
	2h 17m 58s

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