Bump debian from 13.3-slim to 13.4-slim in /dockerfiles/gh-cli

Bumps debian from 13.3-slim to 13.4-slim.

---
updated-dependencies:
- dependency-name: debian
  dependency-version: 13.4-slim
  dependency-type: direct:production
...

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

dockerfiles/gh-cli/Dockerfile

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # For running the GitHub CLI.
-FROM debian:13.3-slim AS builder
+FROM debian:13.4-slim AS builder
 
 RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*