Update base64-serde requirement from 0.7 to 0.8 (#326) #596

Job	Run time
format	12s
Clippy	46s
cargo-test (ubuntu-22.04, default, stable)	4m 38s
cargo-build (aarch64-linux-android, ubuntu-22.04)	2m 58s
cargo-test (macos-12, default, stable)	7m 0s
cargo-test (windows-2019, default, stable)	10m 38s
cargo-build (armv7-linux-androideabi, ubuntu-22.04)	3m 2s
cargo-test (ubuntu-22.04, beta)	5m 59s
cargo-build (i686-linux-android, ubuntu-22.04)	2m 55s
cargo-test (ubuntu-22.04, blocking)	6m 4s
cargo-build (x86_64-linux-android, ubuntu-22.04)	3m 0s
cargo-test (ubuntu-22.04, blocking,beta)	6m 34s
cargo-build (x86_64-unknown-linux-musl, ubuntu-22.04)	2m 59s
cargo-test (ubuntu-22.04, tls-rustls --no-default-features)	5m 29s
cargo-build (aarch64-apple-ios, macos-12)	4m 15s
cargo-test (ubuntu-22.04, tls-vendored-openssl --no-default-features)	6m 25s
cargo-test (ubuntu-22.04, beta, default)	3m 38s
cargo-test (ubuntu-22.04, 1.75.0, default)	6m 1s
	1h 22m 33s

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