docker/README.md: advertize 3.13.0

Author: rouault

docker/README.md

@@ -103,11 +103,11 @@ 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 3.12.4 and PROJ 9.8.1, for linux/amd64 and linux/arm64:
-* ghcr.io/osgeo/gdal:alpine-small-3.12.4
-* ghcr.io/osgeo/gdal:alpine-normal-3.12.4
-* ghcr.io/osgeo/gdal:ubuntu-small-3.12.4
-* ghcr.io/osgeo/gdal:ubuntu-full-3.12.4
+Tagged images of recent past releases are available. The last ones (at time of writing) are for GDAL 3.13.0 and PROJ 9.8.1, for linux/amd64 and linux/arm64:
+* ghcr.io/osgeo/gdal:alpine-small-3.13.0
+* ghcr.io/osgeo/gdal:alpine-normal-3.13.0
+* ghcr.io/osgeo/gdal:ubuntu-small-3.13.0
+* ghcr.io/osgeo/gdal:ubuntu-full-3.13.0
 
 ## Multi-arch Images