build(docker): bump debian from 88f88a2 to b3ef39b (#306)

Bumps debian from `88f88a2` to `b3ef39b`.

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Dockerfile

@@ -3,7 +3,7 @@
 ##
 # base
 ##
-FROM debian:stable-slim@sha256:88f88a2b8bd1873876a2ff15df523a66602aa57177e24b5f22064c4886ec398a AS base
+FROM debian:stable-slim@sha256:b3ef39b8a45ee3b689c462dfa711454bcfc9c9965fe81c6cfb7ff4029b5b8cd7 AS base
 LABEL maintainer="[email protected]"
 
 # set up user