chore(deps): update registry.suse.com/suse/sle15:latest docker digest to dfde59a (#2476)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: bitcoin-tools

docker/Dockerfile_sles

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1
-FROM registry.suse.com/suse/sle15:latest@sha256:4cabdcc92f566974fc3420bc80e7d5506f02cd4f5b6f1d687dafd53610250f1c
+FROM registry.suse.com/suse/sle15:latest@sha256:dfde59af02faf3ada71a32a9996e0442533eb98b2291eb5b8783bdac65a8d52e
 
 # Set the terminal type to Xterm.
 ENV TERM=xterm