frigate: pin onnxruntime protobuf version (#445844)

pkgs/by-name/fr/frigate/package.nix

@@ -10,6 +10,7 @@
   frigate,
   nixosTests,
   fetchpatch,
+  protobuf_21,
 }:
 
 let
@@ -38,6 +39,11 @@ let
           hash = "sha256-95xtUzzIxxvDtpHX/5uCHnTQTB8Fc08DZGUOR/SdKLs=";
         };
       });
+      onnxruntime = super.onnxruntime.override (old: {
+        onnxruntime = old.onnxruntime.override (old: {
+          protobuf = protobuf_21;
+        });
+      });
     };
   };
   python3Packages = python.pkgs;