Don't enable support for X25519MLKEM768 by default (yet) #916

Job	Run time
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	2m 27s
clippy	3m 25s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	8m 32s
rustfmt	4s
Test features	7m 29s
Test (stable)	4m 13s
Test FIPS integration	2m 54s
Test (arm-android)	1m 59s
Test (arm64-android)	2m 27s
Test (i686-android)	2m 15s
Test (x86_64-android)	2m 57s
Test (aarch64-ios)	2m 44s
Test (aarch64-ios-sim)	2m 11s
Test (x86_64-ios)	2m 10s
Test (i686-linux)	2m 24s
Test (arm-linux)	2m 20s
Test (aarch64-linux)	2m 21s
Test (arm64-macos)	2m 15s
Test (x86_64-macos)	3m 17s
Test (x86_64-mingw)	7m 52s
Test (i686-msvc)	8m 32s
Test (x86_64-msvc)	6m 14s
	1h 21m 2s

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