esp/ci: Update 'llvm-xtensa-testsuite' ref

Author: gerekon

.gitlab-ci.yml

@@ -18,7 +18,7 @@ variables:
   NEWLIB_REF: "esp-4.1.0_20230425"
   BINUTILS_REF: "esp-2022r1-binutils"
   XTENSA_OVERLAYS_REF: "master"
-  LLVM_GCC_TESTSUITE_REF: "esp-16.0.0-20230419"
+  LLVM_GCC_TESTSUITE_REF: "esp-16.0.0-20230425"
   XTENSA_CLANG_TOOLCHAIN_REF: "esp-15.0.0-20221201"
 
   CROSS_ARM_IMAGE: $CI_DOCKER_REGISTRY/llvm-build-cross-arm:1