Update .github/workflows/build_test.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Lzw655

.github/workflows/build_test.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-20.04
     container: espressif/idf:${{ matrix.idf_ver }}
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
       - name: Build Test Application
         env:
           IDF_TARGET: ${{ matrix.idf_target }}