Update base image from Bullseye to Bookworm

wkhtmltopdf doesn't list a Bookworm download, but is listed under https://github.com/wkhtmltopdf/packaging/releases

Author: rjhenry

Dockerfile

@@ -7,7 +7,7 @@ RUN set -x; \
     && tar xvf bookstack.tar.gz -C /bookstack --strip-components=1 \
     && rm bookstack.tar.gz
 
-FROM php:8.2-apache-bullseye as final
+FROM php:8.2-apache-bookworm as final
 RUN set -x; \
     apt-get update \
     && apt-get install -y --no-install-recommends \
@@ -27,7 +27,7 @@ RUN set -x; \
         curl \
         libzip-dev \
         unzip \
-    && wget -O wkhtmltox.deb https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6.1-2/wkhtmltox_0.12.6.1-2.bullseye_amd64.deb \
+    && wget -O wkhtmltox.deb https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6.1-3/wkhtmltox_0.12.6.1-3.bookworm_amd64.deb \
     && chmod a+x ./wkhtmltox.deb \
     && apt-get install -y ./wkhtmltox.deb \
     && rm ./wkhtmltox.deb \