clang-format prints its version

This helps debugging when result when local and remote runs disagree,
so when looking at the log of the github action, we see which version
of clang it used.

scripts/clang-format.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+clang-format --version
+
 CLANG_FORMAT=$(which clang-format)
 
 # if PATCH_MODE is set to 0, then set it to the empty string so $PATCH_MODE continues to work