feat: upgrade postgresql to v18

BREAKING CHANGE: major upgrade of postgresql to v18

Author: muhlba91

Dockerfile

@@ -1,11 +1,11 @@
 # main container
-FROM ghcr.io/cloudnative-pg/postgresql:17.6-standard-bookworm@sha256:16209b08c84d195930a89dfe4520a8f55d260754ba052e182e3a0e12bebb8633
+FROM ghcr.io/cloudnative-pg/postgresql:18.0-standard-bookworm@sha256:22343fd268d917411fd23da16383b4b1e901dd93e901143750a38376840d99d9
 
 ARG CI_COMMIT_TIMESTAMP
 ARG CI_COMMIT_SHA
 ARG CI_COMMIT_TAG
 ARG CI_UPSTREAM_VERSION
-ARG POSTGRESQL_MAJOR_VERSION=17
+ARG POSTGRESQL_MAJOR_VERSION=18
 ARG VCHORD_VERSION=0.5.3
 
 LABEL org.opencontainers.image.authors="Daniel Muehlbachler-Pietrzykowski <daniel.muehlbachler@niftyside.com>"