Update build.yml

Signed-off-by: Yingwei Zheng <dtcxzyw2333@gmail.com>

.github/workflows/build.yml

@@ -32,6 +32,6 @@ jobs:
     - name: Test
       run: |
         echo "int add(int a, int b) { return a + b; }" > test.c
-        clang -fpass-plugin=./cclang.so test.c -S -emit-llvm
+        clang-21 -fpass-plugin=./cclang.so test.c -S -emit-llvm
         cat test.ll | grep -vqz "nsw"
       working-directory: build