chore(nix): bump libspdk rev for interrupt mode fixes

Update SPDK revision to include iSCSI poll group interrupt registration
and bdev wait_for_examine periodic poller fix, both required for
interrupt mode with custom reactors.

Note: temporarily points to jr42/spdk fork until the upstream PR is
merged into openebs/spdk, at which point owner should revert to
"openebs" and rev/sha256 updated to the merged commit.

Depends-On: openebs/spdk PR (iSCSI + bdev interrupt fixes)
Signed-off-by: Jeremias Reith <jr42@users.noreply.github.com>

Author: jr42

nix/pkgs/libspdk/default.nix

@@ -92,8 +92,8 @@ let
   # Derivation attributes
   #
   spdk = rec {
-    rev = "24775a47ebf16c066cea47e7da98bed2e4d1d798";
-    sha256 = "sha256-4FkDgIgnuETHZSwmz0SzvKju71NcD6aCmJYnh9OuBsM=";
+    rev = "d1a7adab2b1bbbbccf0563824b9b32f3c799e372";
+    sha256 = "sha256-k60hUo8sAECdsYT2rVq+8nVQTqN5wpEyNnUxKsUxv1Y=";
     pname = "libspdk${nameSuffix}";
     version = "25.05-${lib.substring 0 7 rev}";
     name = "${pname}-${version}";
@@ -107,7 +107,7 @@ let
     src = [
       (fetchFromGitHub {
         name = spdk.name;
-        owner = "openebs";
+        owner = "jr42";
         repo = "spdk";
         rev = spdk.rev;
         sha256 = spdk.sha256;