loading a module compiled with engine-dylib from wasmer-cache fails with unaligned buffer

[tzemanovic]

Describe the bug

Hi, I'm trying to load a module compiled with engine-dylib using wasmer-cache. However, loading a module from the cache fails with

Steps to reproduce

I've extended the dylib example with cache to illustrate: heliaxdev@15b980d. This panics with:

thread 'main' panicked at 'assertion failed: `(left == right)`
  left: `4`,
 right: `0`: unaligned buffer, expected alignment 8 but found alignment 4', /y/.cargo/registry/src/github.com-1ecc6299db9ec823/rkyv-0.7.28/src/util/mod.rs:40:5
stack backtrace:
   0: rust_begin_unwind
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/std/src/panicking.rs:517:5
   1: core::panicking::panic_fmt
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/core/src/panicking.rs:101:14
   2: core::panicking::assert_failed_inner
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/core/src/panicking.rs:177:23
   3: core::panicking::assert_failed
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/core/src/panicking.rs:140:5
   4: rkyv::util::check_alignment
             at /y/.cargo/registry/src/github.com-1ecc6299db9ec823/rkyv-0.7.28/src/util/mod.rs:40:5
   5: rkyv::util::archived_value
             at /y/.cargo/registry/src/github.com-1ecc6299db9ec823/rkyv-0.7.28/src/util/mod.rs:60:5
   6: wasmer_engine_dylib::serialize::ModuleMetadata::archive_from_slice
             at ./lib/engine-dylib/src/serialize.rs:79:12
   7: wasmer_engine_dylib::serialize::ModuleMetadata::deserialize
             at ./lib/engine-dylib/src/serialize.rs:69:24
   8: wasmer_engine_dylib::artifact::DylibArtifact::deserialize_from_file_unchecked
             at ./lib/engine-dylib/src/artifact.rs:648:24
   9: wasmer_engine_dylib::artifact::DylibArtifact::deserialize_from_file
             at ./lib/engine-dylib/src/artifact.rs:610:9
  10: <wasmer_engine_dylib::engine::DylibEngine as wasmer_engine::engine::Engine>::deserialize_from_file
             at ./lib/engine-dylib/src/engine.rs:173:21
  11: wasmer::sys::module::Module::deserialize_from_file
             at ./lib/api/src/sys/module.rs:252:24
  12: <wasmer_cache::filesystem::FileSystemCache as wasmer_cache::cache::Cache>::load
             at ./lib/cache/src/filesystem.rs:98:9
  13: engine_dylib::main
             at ./examples/engine_dylib.rs:97:33
  14: core::ops::function::FnOnce::call_once
             at /rustc/59eed8a2aac0230a8b53e89d4e99d55912ba6b35/library/core/src/ops/function.rs:227:5