Regenerate demo output with xargs grep fix

The xargs implementation now correctly handles the "no matches" case
(exit code 123) instead of treating it as an error. This moves the
test-regex-pattern-00010 rule from errors to unmatched, which is the
correct behavior when a pattern legitimately finds no matches.

The rule searches for "--pf-" pattern in .css/.scss files. Since there
are no CSS/SCSS files in the demo examples, it correctly returns zero
violations instead of erroring.

Signed-off-by: tsanders <[email protected]>

Author: tsanders-rh

demo-output.yaml

@@ -1352,9 +1352,9 @@
     error-rule-001: |-
       unable to get query info: yaml: unmarshal errors:
         line 11: cannot unmarshal !!map into string
-    test-regex-pattern-00010: failed to perform file content search - could not run grep with provided pattern exit status 2
   unmatched:
   - file-002
   - lang-ref-002
   - node-sample-rule-003
   - python-sample-rule-003
+  - test-regex-pattern-00010