Revert "reproducible Debian: fix testing suite name (fixes json for tracker.d.o)"

This reverts commit 3cd4cee3.

bin/reproducible_json.py

@@ -60,7 +60,7 @@ for row in result:
     output.append(pkg)
 
     # tracker.d.o should only care about results in testing
-    if pkg['suite'] == 'bullseye':
+    if pkg['suite'] == 'bookworm':
 
         if pkg["status"] in ("E404", "NFU", "blacklisted"):
             # don't export these states in reproducible-tracker.json