fix: wrong metadata branch used in release workflow (#725)

Rather than getting metadata of the tagged version, it was using
data from the latest "nightly" tag.

Author: jacekkow

.github/workflows/release.yml

@@ -15,8 +15,6 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-        with:
-          ref: nightly
 
       - name: Generate metadata
         id: metadata