build: bump debian from 13.0-slim to 13.1-slim

Bumps debian from 13.0-slim to 13.1-slim.

---
updated-dependencies:
- dependency-name: debian
  dependency-version: 13.1-slim
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Dockerfile.debian

@@ -24,7 +24,7 @@ RUN set -eu; \
 	go build -ldflags "-X main.buildVersion=${FOREGO_VERSION}" -o forego .; \
 	go clean -cache
 
-FROM debian:13.0-slim
+FROM debian:13.1-slim
 
 ARG FOREGO_VERSION
 ENV FOREGO_VERSION=${FOREGO_VERSION}