Pin clang-format in CI recipe not the script itself

Author: mcspr

.github/workflows/style-check.yml

@@ -27,7 +27,7 @@ jobs:
       run: |
           sudo apt update
           python ./tests/test_restyle.py --quiet
-          bash ./tests/ci/style_check.sh
+          env CLANG_FORMAT="clang-format-18" bash ./tests/ci/style_check.sh
 
   # Validate orthography
 

tests/restyle.sh

@@ -8,8 +8,7 @@ test -d ${root}/cores/esp8266
 test -d ${root}/libraries
 
 # allow `env CLANG_FORMAT=clang-format-N`, or some other version
-# default to v15, latest stable version from ubuntu-latest Github Actions image
-CLANG_FORMAT=${CLANG_FORMAT:-clang-format-15}
+CLANG_FORMAT=${CLANG_FORMAT:-clang-format}
 
 cd $root
 python $root/tests/restyle.py format --clang-format=$CLANG_FORMAT preset --include core --include arduino