Revert "build: bump debian to bullseye"

Oops, that was a downgrade.

This reverts commit 5834170.

Author: Sjors

contrib/build-wine.Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:bullseye-slim
+FROM debian:bookworm-slim
 
 SHELL ["/bin/bash", "-c"]
 
@@ -15,7 +15,7 @@ RUN apt-get install -y \
 RUN dpkg --add-architecture i386
 RUN wget -nc https://dl.winehq.org/wine-builds/winehq.key
 RUN apt-key add winehq.key
-RUN echo "deb https://dl.winehq.org/wine-builds/debian/ bullseye main" >> /etc/apt/sources.list
+RUN echo "deb https://dl.winehq.org/wine-builds/debian/ bookworm main" >> /etc/apt/sources.list
 RUN apt-get update
 RUN apt-get install --install-recommends -y \
     wine-stable-amd64 \

contrib/build.Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:bullseye-slim
+FROM debian:buster-slim
 
 SHELL ["/bin/bash", "-c"]