Drop x86_64-apple-darwin release target

ort-sys (ONNX Runtime) does not provide prebuilt binaries for Intel Mac
and cannot cross-compile from ARM runners.

Author: Dylan Bobby Storey

.github/workflows/release.yml

@@ -24,9 +24,6 @@ jobs:
           - target: aarch64-unknown-linux-gnu
             runner: ubuntu-24.04-arm
             asset: arawn-linux-aarch64.tar.gz
-          - target: x86_64-apple-darwin
-            runner: macos-latest
-            asset: arawn-darwin-x86_64.tar.gz
           - target: aarch64-apple-darwin
             runner: macos-latest
             asset: arawn-darwin-aarch64.tar.gz