Bump debian in /dockerfiles/pool-trigger-resource

Bumps debian from 13.6-slim to 13.7-slim.

---
updated-dependencies:
- dependency-name: debian
  dependency-version: 13.7-slim
  dependency-type: direct:production
...

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

dockerfiles/pool-trigger-resource/Dockerfile

@@ -9,7 +9,7 @@
 # to use newer versions of linux, jq, and git. The "assets" directory's source code is copied from
 # https://github.com/cfmobile/pool-trigger-resource/tree/master/assets as of commit efefe018c88e937.
 
-FROM debian:13.6-slim
+FROM debian:13.7-slim
 
 RUN apt-get update && apt-get install -y ca-certificates jq git && rm -rf /var/lib/apt/lists/*