Update buildkite plugin equinixmetal-buildkite/trivy to v1.22.0

Author: renovate[bot]

.buildkite/pipeline.yaml

@@ -759,7 +759,7 @@ steps:
               push: false
               build-args:
                 - NAME=${APP_NAME}
-          - equinixmetal-buildkite/trivy#v1.19.0:
+          - equinixmetal-buildkite/trivy#v1.22.0:
               severity: CRITICAL,HIGH
               ignore-unfixed: true
               scanners: misconfig,secret,vuln