Update examples/reprepro/conf to a more recent Debian release

Debian/etch AKA v4.0 is really no longer relevant nowadays,
let's update the example for usage with Debian/bookworm. :)

examples/reprepro/conf/distributions

@@ -1,10 +1,11 @@
 Origin: Debian
 Label: Debian-All
-Suite: stable
-Codename: etch
-Version: 4.0
-Architectures: i386
-Components: main contrib non-free
-Description: Debian
-Update: debian
-# SignWith: yes
+Codename: bookworm
+Description: Debian bookworm mirror
+Architectures: amd64 source
+Components: main contrib non-free non-free-firmware
+Contents: .gz
+Update: - debian-bookworm
+Tracking: minimal
+Log: bookworm
+# SignWith: ...

examples/reprepro/conf/updates

@@ -1,4 +1,8 @@
-Name: debian
-Method: http://ftp.debian.org/debian/
-# Method: http://localhost/debian/
-# Fallback: http://snapshot.debian.net/archive/2007/04/02/debian/
+Name: debian-bookworm
+Method: http://deb.debian.org/debian
+Suite: bookworm
+Components: main contrib non-free non-free-firmware
+Architectures: amd64 source
+GetInRelease: no
+# VerifyRelease: 0E98404D386FA1D9
+# Fallback: http://snapshot.debian.net/archive/2023/02/02/debian/