CI(deps): Update alpine Docker tag to v3.23 (releasebranch_8_4) (#6798)

* CI(deps): Update alpine Docker tag to v3.23

* docker(alpine): Update postgresql client to use postgresql18-client

Was using postgresql15-client before, which is unavailable on that newer alpine version

* docker(alpine): Fix casing of FROM ... AS (partial backport of 15731bc)

Co-authored-by: neteler <1295172+neteler@users.noreply.github.com>

* Partial backport of: "docker: hardcode versioned GISBASE path on Alpine (#5137)"

Only the part adding the renovate update comment for GDAL-GRASS

Co-authored-by: nilason <14186207+nilason@users.noreply.github.com>

* docker(alpine): Fix casing of FROM ... AS

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Edouard Choinière <27212526+echoix@users.noreply.github.com>
Co-authored-by: neteler <1295172+neteler@users.noreply.github.com>
Co-authored-by: nilason <14186207+nilason@users.noreply.github.com>

Author: 4 people

docker/alpine/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.21@sha256:c3f8e73fdb79deaebaa2037150150191b9dcbfba68b4a46d70103204c53f4709 as common
+FROM alpine:3.23@sha256:25109184c71bdad752c8312a8623239686a9a2071e8825f20acb8f2198c3f659 AS common
 
 # Based on:
 # https://github.com/mundialis/docker-grass-gis/blob/master/Dockerfile
@@ -59,7 +59,7 @@ ENV GRASS_RUN_PACKAGES="\
       python3 \
       pdal \
       pdal-dev \
-      postgresql15-client \
+      postgresql18-client \
       proj-util \
       sqlite \
       sqlite-libs \
@@ -80,7 +80,7 @@ RUN echo "Install main packages";\
     apk add --no-cache $GRASS_RUN_PACKAGES
 
 
-FROM common as build
+FROM common AS build
 
 # ================
 # CONFIG VARIABLES
@@ -168,6 +168,7 @@ RUN echo "  => Configure and compile grass" && \
     ldconfig /etc/ld.so.conf.d
 
 # Build the GDAL-GRASS plugin
+# renovate: datasource=github-tags depName=OSGeo/gdal-grass
 ARG GDAL_GRASS_VERSION=2.0.0
 RUN git clone --branch $GDAL_GRASS_VERSION --depth 1 https://github.com/OSGeo/gdal-grass.git /src/gdal-grass
 WORKDIR /src/gdal-grass
@@ -187,7 +188,8 @@ RUN cp /usr/local/grass/gui/wxpython/xml/module_items.xml module_items.xml; \
     mkdir -p /usr/local/grass/gui/wxpython/xml/; \
     mv module_items.xml /usr/local/grass/gui/wxpython/xml/module_items.xml;
 
-FROM common as grass
+
+FROM common AS grass
 
 # GRASS GIS specific
 # allow work with MAPSETs that are not owned by current user