Update dependency cargo-deny to v0.18.8 (#12443)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ concurrency:
 env:
   CARGO_TERM_COLOR: always
   # renovate: datasource=crate depName=cargo-deny versioning=semver
-  CARGO_DENY_VERSION: 0.18.7
+  CARGO_DENY_VERSION: 0.18.8
   # renovate: datasource=github-releases depName=cargo-insta lookupName=mitsuhiko/insta versioning=semver
   CARGO_INSTA_VERSION: 1.44.3
   # renovate: datasource=crate depName=cargo-machete versioning=semver