build: bump nix dependency

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

src/bin/proxmox_backup_client/mount.rs

@@ -144,7 +144,7 @@ fn mount(
     // Process should be deamonized.
     // Make sure to fork before the async runtime is instantiated to avoid troubles.
     let pipe = pipe()?;
-    match fork() {
+    match unsafe { fork() } {
         Ok(ForkResult::Parent { .. }) => {
             nix::unistd::close(pipe.1).unwrap();
             // Blocks the parent process until we are ready to go in the child

src/tools/daemon.rs

@@ -101,10 +101,10 @@ impl Reloader {
 
         // Start ourselves in the background:
         use nix::unistd::{fork, ForkResult};
-        match fork() {
+        match unsafe { fork() } {
             Ok(ForkResult::Child) => {
                 // Double fork so systemd can supervise us without nagging...
-                match fork() {
+                match unsafe { fork() } {
                     Ok(ForkResult::Child) => {
                         std::mem::drop(pold);
                         // At this point we call pre-exec helpers. We must be certain that if they fail for