Update `Ciphertext` bindings #454

Job	Run time
yarn-test (stable, wasm32-unknown-unknown)	5m 21s
python-test (stable, wasm32-unknown-unknown, 3.10)	2m 5s
check	5m 15s
wasm-test (1.67, wasm32-unknown-unknown)	9m 48s
wasm-test (stable, wasm32-unknown-unknown)	7m 38s
test (x86_64-unknown-linux-gnu, 1.67)	6m 23s
test (x86_64-unknown-linux-gnu, stable)	5m 57s
codecov	9m 4s
benchmark	0s
	51m 31s

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