Bump debian from 12 to 13 in /images/litecoind

Bumps debian from 12 to 13.

---
updated-dependencies:
- dependency-name: debian
  dependency-version: '13'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

images/litecoind/Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.3-labs
-FROM debian:12@sha256:b6507e340c43553136f5078284c8c68d86ec8262b1724dde73c325e8d3dcdeba as build
+FROM debian:13@sha256:6d87375016340817ac2391e670971725a9981cfc24e221c47734681ed0f6c0f5 as build
 
 ARG VERSION=v0.21.4