chore: add custom runner configurations for GitHub Actions in dist-workspace.toml

Author: ozan2003

dist-workspace.toml

@@ -15,3 +15,7 @@ targets = ["aarch64-apple-darwin", "aarch64-unknown-linux-gnu", "x86_64-apple-da
 install-path = "CARGO_HOME"
 # Whether to install an updater program
 install-updater = false
+
+[dist.github-custom-runners]
+aarch64-apple-darwin = "macos-15-intel"
+x86_64-apple-darwin = "macos-14-intel"