fix: docker/db.Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-5927133
- https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-5927133
- https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-5927133
- https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-5927133
- https://snyk.io/vuln/SNYK-DEBIAN11-ZLIB-6008961

docker/db.Dockerfile

@@ -1,7 +1,7 @@
 # =====================
 # --- Builder Stage ---
 # =====================
-FROM postgres:14.6 AS builder
+FROM postgres:14 AS builder
 
 ENV POSTGRES_PASSWORD=hk2j22sfiv
 ENV POSTGRES_USER=django
@@ -19,7 +19,7 @@ RUN ["/usr/local/bin/docker-entrypoint.sh", "postgres"]
 # ===================
 # --- Final Image ---
 # ===================
-FROM postgres:14.6
+FROM postgres:14
 LABEL maintainer="IETF Tools Team <[email protected]>"
 
 COPY --from=builder /data $PGDATA