tools/ci.sh: Upgrade Zephyr docker image 0.24.2 and SDK 0.15.0.

Upgrades CI to use the latest versions of the Zephyr docker image and
Zephyr SDK.

Signed-off-by: Maureen Helm <maureen.helm@intel.com>

tools/ci.sh

@@ -684,8 +684,8 @@ function ci_windows_build {
 ########################################################################################
 # ports/zephyr
 
-ZEPHYR_DOCKER_VERSION=v0.21.0
-ZEPHYR_SDK_VERSION=0.13.2
+ZEPHYR_DOCKER_VERSION=v0.24.2
+ZEPHYR_SDK_VERSION=0.15.0
 ZEPHYR_VERSION=v3.1.0
 
 function ci_zephyr_setup {