docker/README.md: advertize 3.11.3 Docker images [ci skip]

Author: rouault

docker/README.md

@@ -101,11 +101,11 @@ If you are getting a ``<jemalloc>: arena 0 background thread creation failed (1)
 
 # Images of releases
 
-Tagged images of recent past releases are available. The last ones (at time of writing) are for GDAL 3.11.1 and PROJ 9.6.2, for linux/amd64 and linux/arm64:
-* ghcr.io/osgeo/gdal:alpine-small-3.11.1
-* ghcr.io/osgeo/gdal:alpine-normal-3.11.1
-* ghcr.io/osgeo/gdal:ubuntu-small-3.11.1
-* ghcr.io/osgeo/gdal:ubuntu-full-3.11.1
+Tagged images of recent past releases are available. The last ones (at time of writing) are for GDAL 3.11.3 and PROJ 9.6.2, for linux/amd64 and linux/arm64:
+* ghcr.io/osgeo/gdal:alpine-small-3.11.3
+* ghcr.io/osgeo/gdal:alpine-normal-3.11.3
+* ghcr.io/osgeo/gdal:ubuntu-small-3.11.3
+* ghcr.io/osgeo/gdal:ubuntu-full-3.11.3
 
 ## Multi-arch Images