[FIX] *: Odoo 16 requires postgresql 12

Update the minimal version in the installation doc
Make all postgresql docs references target the v12 documentation
Fix some non http links on the way

closes odoo/documentation#2822

X-original-commit: 93b383e95d
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

content/administration/install/deploy.rst

@@ -97,7 +97,7 @@ Configuration sample
 * Allow tcp connection on localhost
 * Allow tcp connection from 192.168.1.x network
 
-in ``/etc/postgresql/9.5/main/pg_hba.conf`` set:
+in ``/etc/postgresql/<YOUR POSTGRESQL VERSION>/main/pg_hba.conf`` set:
 
 .. code-block:: text
 
@@ -105,7 +105,7 @@ in ``/etc/postgresql/9.5/main/pg_hba.conf`` set:
   host    all             all             127.0.0.1/32            md5
   host    all             all             192.168.1.0/24          md5
 
-in ``/etc/postgresql/9.5/main/postgresql.conf`` set:
+in ``/etc/postgresql/<YOUR POSTGRESQL VERSION>/main/postgresql.conf`` set:
 
 .. code-block:: text
 
@@ -172,7 +172,7 @@ in Odoo the db_sslmode control the ssl security of the connection
 with value chosen out of 'disable', 'allow', 'prefer', 'require', 'verify-ca'
 or 'verify-full'
 
-`PostgreSQL Doc <https://www.postgresql.org/docs/current/static/libpq-ssl.html>`_
+`PostgreSQL Doc <https://www.postgresql.org/docs/12/static/libpq-ssl.html>`_
 
 .. _builtin_server:
 
@@ -741,8 +741,8 @@ Here are the supported browsers:
 .. _socat: http://www.dest-unreach.org/socat/
 .. _PostgreSQL connection settings:
 .. _listen to network interfaces:
-    https://www.postgresql.org/docs/9.6/static/runtime-config-connection.html
+    https://www.postgresql.org/docs/12/static/runtime-config-connection.html
 .. _use an SSH tunnel:
-    https://www.postgresql.org/docs/9.6/static/ssh-tunnels.html
+    https://www.postgresql.org/docs/12/static/ssh-tunnels.html
 .. _WSGI: https://wsgi.readthedocs.org/
 .. _POSBox: https://www.odoo.com/page/point-of-sale-hardware#part_2