ci: Use sdk-build v1.3.8

This commit updates the CI workflow to use the SDK build image v1.3.8,
which includes more up-to-date MinGW-w64 toolchain (v12.0.0) with win32
and posix thread model support.

The posix thread model support is necessary for building Windows LLVM,
which makes use of `std::thread`, which depends on pthread.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

.github/workflows/ci.yml

@@ -247,7 +247,7 @@ jobs:
           MATRIX_HOSTS+='{
               "name": "linux-x86_64",
               "runner": "zephyr-runner-v2-linux-x64-4xlarge",
-              "container": "ghcr.io/zephyrproject-rtos/sdk-build:v1.3.4",
+              "container": "ghcr.io/zephyrproject-rtos/sdk-build:v1.3.8",
               "archive": "tar.xz"
             },'
         fi
@@ -256,7 +256,7 @@ jobs:
           MATRIX_HOSTS+='{
               "name": "linux-aarch64",
               "runner": "zephyr-runner-v2-linux-arm64-4xlarge",
-              "container": "ghcr.io/zephyrproject-rtos/sdk-build:v1.3.4",
+              "container": "ghcr.io/zephyrproject-rtos/sdk-build:v1.3.8",
               "archive": "tar.xz"
             },'
         fi
@@ -283,7 +283,7 @@ jobs:
           MATRIX_HOSTS+='{
               "name": "windows-x86_64",
               "runner": "zephyr-runner-v2-linux-x64-4xlarge",
-              "container": "ghcr.io/zephyrproject-rtos/sdk-build:v1.3.4",
+              "container": "ghcr.io/zephyrproject-rtos/sdk-build:v1.3.8",
               "archive": "7z"
             },'
         fi