[docker] let metadata-action automatically generate 'latest' tags

.github/workflows/docker.yml

@@ -45,9 +45,6 @@ jobs:
         tags: |
           type=sha,format=long,prefix=
           type=ref,event=tag
-        # https://github.com/docker/metadata-action/issues/112
-        flavor: |
-          latest=${{ github.ref == 'refs/heads/master' }}
 
     # https://github.com/docker/build-push-action
     - name: Build image

gallery_dl/version.py

@@ -6,4 +6,4 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-__version__ = "1.26.4"
+__version__ = "1.26.5-dev"