bump `aes` to `0.8.3` and `fpe` to `0.6` #123

Job	Run time
Clippy (1.51.0)	1m 13s
Clippy (nightly)	51s
Bitrot check	1m 6s
Build target wasm32-unknown-unknown	1m 12s
Code coverage	3m 26s
Build target wasm32-wasi	1m 13s
Intra-doc links	1m 11s
Rustfmt	1m 9s
Test on ubuntu-latest	1m 9s
Test on windows-latest	1m 22s
Test on macOS-latest	1m 15s
	15m 7s

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