fix: fix build workflow

Author: n15421

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
 
       - uses: xmake-io/github-action-setup-xmake@v1
         with:
-          xmake-version: branch@master
+          xmake-version: 2.9.9
 
       - run: |
           xmake repo -u

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
 
       - uses: xmake-io/github-action-setup-xmake@v1
         with:
-          xmake-version: branch@master
+          xmake-version: 2.9.9
 
       - run: |
           xmake repo -u