Update `Ciphertext` bindings #464

Job	Run time
yarn-test (stable, wasm32-unknown-unknown)	5m 15s
python-test (stable, wasm32-unknown-unknown, 3.10)	1m 56s
wasm-test (1.67, wasm32-unknown-unknown)	9m 18s
wasm-test (stable, wasm32-unknown-unknown)	6m 53s
check	49s
test (x86_64-unknown-linux-gnu, 1.67)	7m 25s
test (x86_64-unknown-linux-gnu, stable)	4m 9s
codecov	8m 44s
benchmark	0s
	44m 29s

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