build(deps): bump rust from 26abcef to a818c23

Bumps rust from `26abcef` to `a818c23`.

---
updated-dependencies:
- dependency-name: rust
  dependency-version: 1.96-slim
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -25,7 +25,7 @@
 # ── Builder stage ─────────────────────────────────────────────────────────────
 # rust:1.96-slim multi-arch manifest-list digest (2026-05-28). Matches
 # the workspace's `rust-toolchain.toml` channel = "stable".
-FROM rust:1.96-slim@sha256:26abcef3d79b8d890c4ceb17093154573e1f6479cf6dd7c1450043b8458350f6 AS builder
+FROM rust:1.96-slim@sha256:a818c23087b65be495e78fa329d577481e7700748bb2d1f28658b6bce3c7b931 AS builder
 
 # cargo-auditable embeds the dep graph in the produced binary so post-build
 # `osv-scanner sbom-from-binary`, `syft`, and `grype` can re-derive the