chore(deps): bump postgres from 17-bookworm to 18-bookworm

Bumps postgres from 17-bookworm to 18-bookworm.

---
updated-dependencies:
- dependency-name: postgres
  dependency-version: 18-bookworm
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile.extra

@@ -16,7 +16,7 @@ COPY . .
 RUN CGO_ENABLED=0 GOOS=linux go build -o pgconfig ./cmd
 
 # Main stage
-FROM postgres:17-bookworm
+FROM postgres:18-bookworm
 
 # Get architecture information
 ARG TARGETARCH