buildkite: Skip cargo audit check temporarily

Until our container moves to cargo audit v0.12.0.
See rustsec/advisory-db#414 (comment)

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

.buildkite/pipeline.yml

@@ -207,6 +207,7 @@ steps:
   - label: "cargo-audit"
     commands:
       - cargo audit -q
+    skip: "Skipping until we move cargo audit to v0.12.0. See https://github.com/RustSec/advisory-db/issues/414#issuecomment-702479926"
     retry:
       automatic: false
     agents: