postgres data-observability - sync croniter to agent requirements

CI dep validator requires croniter (introduced as a postgres dependency for
cron-scheduled queries) to also be pinned in agent_requirements.in. Adds the
matching pin so the dep validator passes.

Signed-off-by: mobuchowski <maciej.obuchowski@datadoghq.com>

Author: mobuchowski

agent_requirements.in

@@ -10,6 +10,7 @@ cachetools==7.0.5
 clickhouse-connect==0.14.1
 cm-client==45.0.4
 confluent-kafka==2.13.2
+croniter==6.2.2
 cryptography==46.0.7
 ddtrace==3.19.5
 dnspython==2.8.0