fix typo in signature

Signed-off-by: Aurélien Bombo <abombo@microsoft.com>

SPECS/kata-containers/kata-containers.signatures.json

@@ -2,7 +2,7 @@
   "Signatures": {
     "50-kata": "fb108c6337b3d3bf80b43ab04f2bf9a3bdecd29075ebd16320aefe8f81c502a7",
     "mariner-build-uvm.sh": "0777a17a6fab43ccbf167b18e2170d3db2b5727885843468037a9953cad9df0a",
-    "kata-containers-3.8.0.azl0.tar.gz": "0b8926a21a1fd15f85093fecf9642dc14cf380d87e6b0d725edbf09e5e4fece5 ",
+    "kata-containers-3.8.0.azl0.tar.gz": "0b8926a21a1fd15f85093fecf9642dc14cf380d87e6b0d725edbf09e5e4fece5",
     "kata-containers-3.8.0.azl0-cargo.tar.gz": "73939a7f64f05ca62f32e59a03267080a5463499bcb3ca30410b374958fc1eb0"
   }
 }