ci: env.sh: default to Zephyr 3.7

Author: tylerwhall

ci/env.sh

@@ -2,7 +2,7 @@
 
 ZEPHYR_RUST="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )/.."
 RUST_VERSION="$( rustc --version | awk '{print $2}' )"
-ZEPHYR_VERSION=${ZEPHYR_VERSION:-2.4.0}
+ZEPHYR_VERSION=${ZEPHYR_VERSION:-3.7.0}
 # Set CONTAINER_REGISTRY to something like "zephyr-rust:" to use local images
 CONTAINER_REGISTRY=${CONTAINER_REGISTRY:-ghcr.io/tylerwhall/zephyr-rust:zephyr-rust-}