Update rules/cross-platform/execution_via_github_runner_with_runner_tracking_id_tampering_via_env_vars.toml

Author: Aegrah

rules/cross-platform/execution_via_github_runner_with_runner_tracking_id_tampering_via_env_vars.toml

@@ -67,7 +67,7 @@ severity = "medium"
 tags = [
     "Domain: Endpoint",
     "OS: Linux",
-    "OS: MacOS",
+    "OS: macOS",
     "Use Case: Threat Detection",
     "Tactic: Execution",
     "Tactic: Initial Access",