Fix newline in job summary

Author: mbg

.github/workflows/script/check-js.sh

@@ -17,7 +17,8 @@ if [ ! -z "$(git status --porcelain)" ]; then
     >&2 echo "Failed: JavaScript files are not up to date. Run 'rm -rf lib && npm run-script build' to update"
     git status
 
-    echo "### Transpiled JS diff\n" >> $GITHUB_STEP_SUMMARY
+    echo "### Transpiled JS diff" >> $GITHUB_STEP_SUMMARY
+    echo "" >> $GITHUB_STEP_SUMMARY
     echo '```diff' >> $GITHUB_STEP_SUMMARY
     git diff --output="$RUNNER_TEMP/js.diff"
     cat "$RUNNER_TEMP/js.diff" >> $GITHUB_STEP_SUMMARY