chore: upgrade userfaultfd to 0.5.1

userfaultfd brings in an old version of proc-macro2 crate which breaks
the compilation of aws-lc-rs. Update it to 0.5.1 to fix the issue. We
were also planning to do that anyway, since userfaultfd was bringing in
a very old version of the nix crate.

Fixes #3608

Signed-off-by: Babis Chalios <[email protected]>

Author: bchalios

src/vmm/Cargo.toml

@@ -20,7 +20,7 @@ serde = { version = "1.0.136", features = ["derive"] }
 serde_json = "1.0.78"
 timerfd = "1.2.0"
 thiserror = "1.0.32"
-userfaultfd = "0.5.0"
+userfaultfd = "0.5.1"
 versionize = "0.1.10"
 versionize_derive = "0.1.5"
 vm-allocator = "0.1.0"

tests/host_tools/uffd/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2021"
 libc = "0.2.117"
 serde = { version = "1.0.136", features = ["derive"] }
 serde_json = "1.0.78"
-userfaultfd = "0.5.0"
+userfaultfd = "0.5.1"
 
 utils = { path = "../../../src/utils" }