Windows Docker build - bump Debian bullseye -> trixie

Will be needed for Qt 6 since the Bullseye mingw gcc is too old (no
<future>). Anyway there is no reason not to use the newest compiler for
Windows builds.

Author: slipher

Dockerfile.win

@@ -10,7 +10,7 @@
 # from .git since a checked-in file will not be ignored. For aria2 it is assumed that the data
 # is stored in the updater/.git/modules directory.
 
-FROM docker.io/debian:bullseye-slim
+FROM docker.io/debian:trixie-slim
 
 # Prevents warning spam from Qt 6's rcc
 ENV LANG=C.UTF-8
@@ -21,13 +21,13 @@ RUN apt-get update && apt-get install -y \
     curl \
     gettext \
     g++ \
-    g++-mingw-w64-i686 \
+    g++-mingw-w64-i686-posix \
     git \
     libtool \
     make \
     p7zip-full \
     pkg-config \
-    python \
+    python3 \
     xz-utils
 
 # The Schannel dependencies are spelled with capital letters which causes them not to be found