ci: Try a slightly different mechanism to get the swift version, to attempt to resolve issues showing up in CI for wasm builds.

Author: scottmarchant

scripts/install_wasm_sdk.sh

@@ -18,6 +18,6 @@
 
 set -euo pipefail
 
-version="$(swiftc --version | head -n1)"
+version="$(swift --version | head -n1)"
 tag="$(curl -sL "https://raw.githubusercontent.com/swiftwasm/swift-sdk-index/refs/heads/main/v1/tag-by-version.json" | jq -e -r --arg v "$version" '.[$v] | .[-1]')"
 curl -sL "https://raw.githubusercontent.com/swiftwasm/swift-sdk-index/refs/heads/main/v1/builds/$tag.json" | jq -r '.["swift-sdks"]["wasm32-unknown-wasi"] | "swift sdk install \"\(.url)\" --checksum \"\(.checksum)\""' | sh -x