Drop upload and signing of version files in ghcr.io (#399)

The upload and signing of version files to ghcr.io was an experiment and
is not really necessary. Let's drop it. This should unblock our CI and
allow updating the version file (which is currently blocked due to the
request rate limiting).

.github/workflows/version.yml

@@ -104,13 +104,8 @@ jobs:
       - name: Install AWS CLI
         run: pip install awscli
 
-      - name: Upload file
-        run: |
-          cosign upload blob -f ${{ matrix.path }} ghcr.io/home-assistant/version/${{ matrix.path }}
-
       - name: Sign Cosign
         run: |
-          cosign sign --yes ghcr.io/home-assistant/version/${{ matrix.path }}
           cosign sign-blob --yes ${{ matrix.path }} --bundle ${{ matrix.path }}.sig
 
       - name: Upload signature