build(deps): bump ubuntu in /tools/ubuntu-cross

Bumps ubuntu from `66460d5` to `e96e81f`.

---
updated-dependencies:
- dependency-name: ubuntu
  dependency-version: noble
  dependency-type: direct:production
...

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

Author: dependabot[bot]

tools/ubuntu-cross/Dockerfile

@@ -1,5 +1,5 @@
 FROM --platform=${BUILDPLATFORM} tonistiigi/xx:master@sha256:e38fcb938a3b7ee3e513de596bf6daa1e634335f9e4da890d8fdbd8ef36d5517 AS xx
-FROM --platform=${BUILDPLATFORM} ubuntu:noble@sha256:66460d557b25769b102175144d538d88219c077c678a49af4afca6fbfc1b5252 AS build
+FROM --platform=${BUILDPLATFORM} ubuntu:noble@sha256:e96e81f410a9f9cae717e6cdd88cc2a499700ff0bb5061876ad24377fcc517d7 AS build
 COPY --from=xx / /
 
 RUN <<EOF