Remove checkout for specific iverilog git version

Author: mmicko

.github/workflows/test-build.yml

@@ -89,7 +89,6 @@ jobs:
         run: |
           git clone https://github.com/steveicarus/iverilog.git
           cd iverilog
-          git checkout 192b6aec96fde982e6ddcb28b346d5893aa8e874
           echo "IVERILOG_GIT=$(git rev-parse HEAD)" >> $GITHUB_ENV
 
       - name: Cache iverilog