ci: Upgrade to Debian Bookworm

Bullseye is getting long in the tooth, upgrade to the current stable version.

Backpatch to all versions with CI support, we don't want to generate CI images
for multiple Debian versions.

Author: Nazir Bilal Yavuz <byavuz81@gmail.com>
Discussion: https://postgr.es/m/CAN55FZ0fY5EFHXLKCO_%3Dp4pwFmHRoVom_qSE_7B48gpchfAqzw%40mail.gmail.com
Backpatch: 15-, where CI was added

.cirrus.tasks.yml

@@ -65,7 +65,7 @@ task:
     CPUS: 4
     BUILD_JOBS: 8
     TEST_JOBS: 8
-    IMAGE_FAMILY: pg-ci-bullseye
+    IMAGE_FAMILY: pg-ci-bookworm
     CCACHE_DIR: ${CIRRUS_WORKING_DIR}/ccache_dir
     # no options enabled, should be small
     CCACHE_MAXSIZE: "150M"
@@ -243,7 +243,7 @@ task:
     CPUS: 4
     BUILD_JOBS: 4
     TEST_JOBS: 8 # experimentally derived to be a decent choice
-    IMAGE_FAMILY: pg-ci-bullseye
+    IMAGE_FAMILY: pg-ci-bookworm
 
     CCACHE_DIR: /tmp/ccache_dir
     DEBUGINFOD_URLS: "https://debuginfod.debian.net"
@@ -314,7 +314,7 @@ task:
     #DEBIAN_FRONTEND=noninteractive apt-get -y install ...
 
   matrix:
-    - name: Linux - Debian Bullseye - Autoconf
+    - name: Linux - Debian Bookworm - Autoconf
 
       env:
         SANITIZER_FLAGS: -fsanitize=address
@@ -348,7 +348,7 @@ task:
       on_failure:
         <<: *on_failure_ac
 
-    - name: Linux - Debian Bullseye - Meson
+    - name: Linux - Debian Bookworm - Meson
 
       env:
         CCACHE_MAXSIZE: "400M" # tests two different builds
@@ -375,7 +375,7 @@ task:
             ${LINUX_MESON_FEATURES} \
             -Dllvm=disabled \
             --pkg-config-path /usr/lib/i386-linux-gnu/pkgconfig/ \
-            -DPERL=perl5.32-i386-linux-gnu \
+            -DPERL=perl5.36-i386-linux-gnu \
             -DPG_TEST_EXTRA="$PG_TEST_EXTRA" \
             build-32
         EOF
@@ -651,7 +651,7 @@ task:
   env:
     CPUS: 4
     BUILD_JOBS: 4
-    IMAGE_FAMILY: pg-ci-bullseye
+    IMAGE_FAMILY: pg-ci-bookworm
 
     # Use larger ccache cache, as this task compiles with multiple compilers /
     # flag combinations