update userfaultfd to 0.4.1 (#3442)

which updates nix to 0.23.0, getting rid of the benign RUSTSEC-2021-0119
in our dep tree

Cargo.lock

@@ -1653,15 +1653,15 @@ checksum = "0debeb9fcf88823ea64d64e4a815ab1643f33127d995978e099942ce38f25238"
 
 [[package]]
 name = "nix"
-version = "0.17.0"
+version = "0.23.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50e4785f2c3b7589a0d0c1dd60285e1188adac4006e8abd6dd578e1567027363"
+checksum = "f305c2c2e4c39a82f7bf0bf65fb557f9070ce06781d4f2454295cc34b1c43188"
 dependencies = [
  "bitflags",
  "cc",
- "cfg-if 0.1.10",
+ "cfg-if 1.0.0",
  "libc",
- "void",
+ "memoffset",
 ]
 
 [[package]]
@@ -3066,9 +3066,9 @@ dependencies = [
 
 [[package]]
 name = "userfaultfd"
-version = "0.3.2"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d0312d3964b9b5be18be4f4274319c1b613bdf7511d640f493bbf632afea5a9"
+checksum = "c0c5a19bdab0e8c45b0116ac7901e5a697e6b1bd40843e1a716b7da2ea6f9c91"
 dependencies = [
  "bitflags",
  "cfg-if 1.0.0",
@@ -3110,12 +3110,6 @@ version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
 
-[[package]]
-name = "void"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
-
 [[package]]
 name = "wait-timeout"
 version = "0.2.0"

crates/runtime/Cargo.toml

@@ -36,7 +36,7 @@ rsix = "0.23.2"
 winapi = { version = "0.3.7", features = ["winbase", "memoryapi", "errhandlingapi", "handleapi"] }
 
 [target.'cfg(target_os = "linux")'.dependencies]
-userfaultfd = { version = "0.3.0", optional = true }
+userfaultfd = { version = "0.4.1", optional = true }
 
 [build-dependencies]
 cc = "1.0"