Opt-out chromium.googlesource.com/external/selenium from vuln scanning

As requested in b/376782726.

Change-Id: If669d50173be9caa19537c03da5957be3738f0e8
Bug: 376782726
Reviewed-on: https://chromium-review.googlesource.com/c/All-Projects/+/5983827
Reviewed-by: Josip Sokcevic <[email protected]>
1 file changed