Use debian 12 distroless image as base image (gardener#263)

Co-authored-by: Alexander Hebel <alexander.hebel@sap.com>

Author: aaronfern

Dockerfile

@@ -10,7 +10,7 @@ COPY . .
 RUN make install
 
 #############      base                                     #############
-FROM gcr.io/distroless/static-debian11:nonroot AS base
+FROM gcr.io/distroless/static-debian12:nonroot AS base
 
 
 ############# machine-controller-manager-provider-openstack #############