docker: Bump to debian:trixie-slim

docker/builder.Dockerfile

@@ -1,7 +1,7 @@
 # See the file "COPYING" in the main distribution directory for copyright.
 
 # Layer to build Zeek.
-FROM debian:bookworm-slim
+FROM debian:13-slim
 
 # Make the shell split commands in the log so we can determine reasons for
 # failures more easily.
@@ -16,6 +16,7 @@ RUN echo 'Acquire::https::timeout "180";' >> /etc/apt/apt.conf.d/99-timeouts
 
 # Configure system for build.
 RUN apt-get -q update \
+ && apt-get upgrade -q -y \
  && apt-get install -q -y --no-install-recommends \
      bind9 \
      bison \
@@ -36,7 +37,7 @@ RUN apt-get -q update \
      libz-dev \
      make \
      python3-minimal \
-     python3.11-dev \
+     python3-dev \
      swig \
      ninja-build \
      python3-pip \