fix: update pegasus regular ci docker version base branch (#1124)

.github/workflows/pegasus-regular-build.yml

@@ -61,6 +61,7 @@ jobs:
         run: |
           git clone --depth=1 https://github.com/apache/incubator-pegasus.git
           cd incubator-pegasus
+          git checkout ${{ github.ref_name }}
       - name: Unpack prebuilt third-parties
         run: unzip /root/thirdparties-bin.zip -d ./thirdparty
       - name: Compilation pegasus on GCC