Fix shell compatibility issue in CI Docker build

Replace bash-specific [[ ]] with POSIX-compatible [ ] for Docker sh compatibility.
The error 'sh: 68: [[: not found' was preventing the WASM build from executing.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Qard

.github/workflows/CI.yml

@@ -146,7 +146,7 @@ jobs:
             ${{ matrix.settings.build }}
             
             # Build the WASI module for Linux targets
-            if [[ "${{ matrix.settings.target }}" == "x86_64-unknown-linux-gnu" ]]; then
+            if [ "${{ matrix.settings.target }}" = "x86_64-unknown-linux-gnu" ]; then
               echo "===== Building fix-python-soname WASI module ====="
               rustup target add wasm32-wasip1
               echo "===== Entering fix-python-soname directory ====="