CI: Fix Zephyr build by updating Zephyr SDK version to 0.16.1

Update zephyr SDK to 0.16.1 to fix CI build issue:
arm-zephyr-eabi-gcc: fatal error: cannot read spec file
'picolibc.specs': No such file or directory
compilation terminated.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>

.github/actions/build_ci/entrypoint.sh

@@ -4,10 +4,10 @@ readonly TARGET="$1"
 
 ZEPHYR_TOOLCHAIN_VARIANT=zephyr
 ZEPHYR_SDK_INSTALL_DIR=/opt/zephyr-sdk
-ZEPHYR_SDK_VERSION=0.15.0
+ZEPHYR_SDK_VERSION=0.16.1
 ZEPHYR_SDK_DOWNLOAD_FOLDER=https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v$ZEPHYR_SDK_VERSION
 ZEPHYR_SDK_SETUP_DIR=zephyr-sdk-$ZEPHYR_SDK_VERSION
-ZEPHYR_SDK_SETUP_TAR=${ZEPHYR_SDK_SETUP_DIR}_linux-x86_64.tar.gz
+ZEPHYR_SDK_SETUP_TAR=${ZEPHYR_SDK_SETUP_DIR}_linux-x86_64.tar.xz
 ZEPHYR_SDK_DOWNLOAD_URL=$ZEPHYR_SDK_DOWNLOAD_FOLDER/$ZEPHYR_SDK_SETUP_TAR
 
 FREERTOS_ZIP_URL=https://cfhcable.dl.sourceforge.net/project/freertos/FreeRTOS/V10.0.1/FreeRTOSv10.0.1.zip