break-time: don't vendor Cargo.lock, use patch for openssl3

pkgs/by-name/br/break-time/package.nix

@@ -21,9 +21,12 @@ rustPlatform.buildRustPackage rec {
     sha256 = "sha256-q79JXaBwd/oKtJPvK2+72pY2YvaR3of2CMC8cF6wwQ8=";
   };
 
-  cargoLock = {
-    lockFile = ./Cargo.lock;
-  };
+  cargoPatches = [
+    # update Cargo.lock to work with openssl 3
+    ./openssl3-support.patch
+  ];
+
+  cargoHash = "sha256-HthrPtIWvYLAQDpW12r250OWP7CF4SORlqFbxIq/Dzo=";
 
   nativeBuildInputs = [
     pkg-config
@@ -37,11 +40,6 @@ rustPlatform.buildRustPackage rec {
     openssl
   ];
 
-  # update Cargo.lock to work with openssl
-  postPatch = ''
-    ln -sf ${./Cargo.lock} Cargo.lock
-  '';
-
   meta = with lib; {
     description = "Break timer that forces you to take a break";
     mainProgram = "break-time";