Upgrade libsodium to 1.0.20

Building with zig build now requires Zig 0.12.
When using the traditional build system, -O3 is used instead of -Ofast.
Improved detection of the compiler flags required on aarch64.
mproved compatibility with custom build systems on aarch64.
apple-xcframework: VisionOS packages are not built if Xcode doesn't include that SDK.
crypto_kdf_hkdf_sha512_statebytes() was added.
When using Visual Studio, runtime CPU feature detection is now enabled on Windows/aarch64.
There were issues with C++ guards affecting usage of libsodium using Swift on Windows. This has been fixed.
Emscripten: crypto_aead_aegis*() functions are now exported in JavaScript builds
Emscripten: unsupported --memory-init-file option has been removed.
apple-xcframework: the minimal deployment target can be set to iOS 11+.
.NET packages now include precompiled libraries for Windows/arm64, iOS, TvOS and Catalyst.
.NET precompiled libraries now work on any CPUs, using only runtime feature detection.
SYSV assembly should not be used when targeting Windows (reported by @meiyese, thanks!)
Compatibility issues with LLVM 18 and AVX512 have been addressed.
GitHub attestation build provenance are now added to NuGet packages.
JavaScript tests can now use Bun as an alternative to Node.

brefphp / aws-lambda-layers