fix: pg image reference (bump minor)

Author: bf4

.github/workflows/build-image.yml

@@ -34,6 +34,6 @@ jobs:
           tags: ghcr.io/x-b-e/server-pg:13
           build-args: |
             PG_MAJOR=13
-            PG_IMAGE=postgis/postgis:13-13.3
+            PG_IMAGE=postgis/postgis:13-3.4
           # outputs: type=image,name=target,annotation-index.org.opencontainers.image.description=XBE server pg
           # cache-from: ghcr.io/x-b-e/server-pg

Dockerfile

@@ -1,7 +1,8 @@
 # syntax=docker/dockerfile:1
 
 ARG PG_MAJOR="13"
-ARG PG_IMAGE="postgis/postgis:13-13.3"
+# see https://hub.docker.com/r/postgis/postgis for valid images
+ARG PG_IMAGE="postgis/postgis:13-3.4"
 
 FROM $PG_IMAGE