Update actions/opex-dashboard-generate/README.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: gunzip

actions/opex-dashboard-generate/README.md

@@ -58,7 +58,7 @@ The scripts are designed to work on both GNU/Linux (GitHub Actions runners) and
 - Path normalization uses a fallback mechanism that works without the GNU-specific `realpath -m` flag
 - All scripts are compatible with both POSIX-compliant shells and bash
 
-For local testing on macOS, ensure you have basic POSIX tools available (`bash`, `find`, `grep`, `sed`, `git`). Optional tools like `yq` provide enhanced parsing but have graceful fallbacks.
+For local testing on macOS, ensure you have basic POSIX tools available (`bash`, `find`, `grep`, `sed`, `git`, `jq`). Optional tools like `yq` provide enhanced parsing but have graceful fallbacks.
 
 ## Documentation