flake/chv: bump cloud-hypervisor-src + adapt to new crate structure

Since PR #7525 (Dec 2025)[0], Cloud Hypervisor uses a virtual Cargo manifest and
the main package was moved to the `./cloud-hypervisor` subdirectory. This change
is effective since v50, which we just upgraded to [1].

[0] cloud-hypervisor/cloud-hypervisor#7525
[1] cyberus-technology/cloud-hypervisor#60

Signed-off-by: Philipp Schuster <[email protected]>
On-behalf-of: SAP [email protected]

Author: phip1611

chv.nix

@@ -15,6 +15,10 @@ let
   craneLib' = craneLib.overrideToolchain rustToolchain;
 
   commonArgs = {
+    # Since Nov 2025 (v50), Cloud Hypervisor has a virtual manifest and the
+    # main package was moved into a sub directory.
+    cargoToml = "${src}/cloud-hypervisor/Cargo.toml";
+
     meta = cloud-hypervisor-meta;
     src = craneLib'.cleanCargoSource cloud-hypervisor-src;