Update PostgreSQL dependency to version 13

Version 12 isn't maintained since November 2024, and earlier versions
aren't maintained since way before that. Furthermore, we no longer know
whether these versions still work with the latest version of Consul
Democracy.

So we're upgrading the requirements to a version that is still supported
and that's expected to work.

publiccode.yml

@@ -121,5 +121,5 @@ dependsOn:
     - name: Node.js
       version: "20.19.2"
     - name: PostgreSQL
-      versionMin: "9.5"
-    - name: ImageMagick
+      versionMin: "13"
+    - name: ImageMagick