fix: docker/postgresql/Dockerfile.postgis to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN12-SQLITE3-6139924
- https://snyk.io/vuln/SNYK-DEBIAN12-GNUTLS28-8705121
- https://snyk.io/vuln/SNYK-DEBIAN12-LIBTASN16-8689970
- https://snyk.io/vuln/SNYK-DEBIAN12-ZLIB-6008963
- https://snyk.io/vuln/SNYK-DEBIAN12-OPENSSL-6592092

docker/postgresql/Dockerfile.postgis

@@ -1,4 +1,4 @@
-FROM postgres:16.3
+FROM postgres:16.7
 
 # Install PostGIS extension
 RUN apt-get update \