Updated postgresql from 16.3 to 16.4

Adjusted postgresql release-monitoring ID to reflect current supported version 16.x

301832 was 15.x and we already upgraded to 16.3 recently on master.
https://release-monitoring.org/project/5601/ (PostgreSQL~current) would get us an RC version: 17 currently. We don't want that.
369409, 16.x points to 17, so nothing really works, go with 5601 PostgreSQL~current as it is most like what we want on master.

369409, 16.x even points to 17, so revert to current and we will have to be careful

deps-packaging/postgresql/cfbuild-postgresql.spec

@@ -1,4 +1,4 @@
-%define postgresql_version 16.3
+%define postgresql_version 16.4
 
 Summary: CFEngine Build Automation -- postgresql
 Name: cfbuild-postgresql

deps-packaging/postgresql/distfiles

@@ -1 +1 @@
-331963d5d3dc4caf4216a049fa40b66d6bcb8c730615859411b9518764e60585  postgresql-16.3.tar.bz2
+971766d645aa73e93b9ef4e3be44201b4f45b5477095b049125403f9f3386d6f  postgresql-16.4.tar.bz2

deps-packaging/postgresql/source

@@ -1 +1 @@
-https://ftp.postgresql.org/pub/source/v16.3/
+https://ftp.postgresql.org/pub/source/v16.4/

deps-packaging/release-monitoring.json

@@ -18,7 +18,7 @@
         "openssl":"2566",
         "pcre2":"5832",
         "php":"3627",
-        "postgresql":"301832",
+        "postgresql":"5601",
         "pthreads-w32":"17517",
         "rsync":"4217",
         "sasl2":"13280",