ci: use Go 1.27 for Windows builds

Signed-off-by: Bryan Bednarski <bbednarski@nvidia.com>

Author: bbednarski9

.github/ci-tool-versions.env

@@ -1,7 +1,7 @@
 # SPDX-FileCopyrightText: Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-NEMO_RELAY_CI_GO_VERSION=1.26.1
+NEMO_RELAY_CI_GO_VERSION=1.27.1
 NEMO_RELAY_CI_DEFAULT_PYTHON_VER=3.11
 NEMO_RELAY_CI_RUST_VERSION=1.96.1
 NEMO_RELAY_CI_NODE_VERSION=24

justfile

@@ -1501,15 +1501,8 @@ test-go:
     prepare_test_plugin_fixtures
 
     if [[ "$is_windows" == true ]]; then
-        compiler_wrapper="$NEMO_RELAY_REPO_ROOT/scripts/go-windows-compiler.sh"
-        if command -v cygpath >/dev/null 2>&1; then
-            compiler_wrapper="$(cygpath -u "$compiler_wrapper")"
-        fi
-        # Go versions before 1.27 pass the MinGW-only -mthreads flag even when
-        # Clang targets MSVC. Filter that one flag while preserving Clang/lld
-        # for the MSVC-built FFI library.
-        export CC="bash \"$compiler_wrapper\" clang"
-        export CXX="bash \"$compiler_wrapper\" clang++"
+        export CC=clang
+        export CXX=clang++
         # Go's Windows linker checks -extldflags before deciding whether to
         # inject a GNU linker script; CGO_LDFLAGS is too late for that check.
         go_ldflags+=(-extldflags=-fuse-ld=lld)