Make sure we safe_eval booleans too

Fixes #5779

lib/ansible/template/__init__.py

@@ -162,7 +162,7 @@ class Templar:
                     result = self._do_template(variable, preserve_trailing_newlines=preserve_trailing_newlines, fail_on_undefined=fail_on_undefined, overrides=overrides)
 
                     # if this looks like a dictionary or list, convert it to such using the safe_eval method
-                    if (result.startswith("{") and not result.startswith(self.environment.variable_start_string)) or result.startswith("["):
+                    if (result.startswith("{") and not result.startswith(self.environment.variable_start_string)) or result.startswith("[") or result in ("True", "False"):
                         eval_results = safe_eval(result, locals=self._available_variables, include_exceptions=True)
                         if eval_results[1] is None:
                             result = eval_results[0]