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

Bumps ubuntu from `e96e81f` to `c35e29c`.

---
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=${BUILDPLATFORM} tonistiigi/xx:master@sha256:12f2048ddc027e4dcd8699c5494fd7a597ba9eadf2817674363d218d46d9ef6a AS xx
-FROM --platform=${BUILDPLATFORM} ubuntu:noble@sha256:e96e81f410a9f9cae717e6cdd88cc2a499700ff0bb5061876ad24377fcc517d7 AS build
+FROM --platform=${BUILDPLATFORM} ubuntu:noble@sha256:c35e29c9450151419d9448b0fd75374fec4fff364a27f176fb458d472dfc9e54 AS build
 COPY --from=xx / /
 
 RUN <<EOF