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Make Cipher method arguments immutable #1721

Job	Run time
Tests / cargo-fmt	19s
Tests / cargo-deny	38s
Tests / cargo-clippy	38s
Tests / inko-fmt	53s
Tests / vale	11s
Tests / amd64-freebsd-native compiler	2m 3s
Tests / amd64-linux-gnu compiler	55s
Tests / amd64-mac-native compiler	2m 1s
Tests / amd64-linux-musl compiler	1m 45s
Tests / amd64-freebsd-native std	4m 31s
Tests / arm64-mac-native compiler	1m 2s
Tests / amd64-linux-gnu std	1m 36s
Tests / amd64-linux-musl std	2m 22s
Tests / amd64-linux-gnu std --release	2m 7s
Tests / amd64-mac-native std	3m 35s
Tests / amd64-linux-musl std --release	3m 0s
Tests / arm64-mac-native std	1m 29s
Tests / amd64-mac-native std --release	2m 50s
Tests / arm64-mac-native std --release	1m 41s
Standard library documentation	2m 25s
Nightly container	3m 1s
Documentation	41s
	39m 43s

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