Remove superfluous permissions (#5)

Turns out the reason the overarching feature metadata package couldn't
be written to was that there was a package by the same name from a
previous attempt of building devcontainer features in a since deleted
repository that still existed!

Author: csutter

.github/workflows/release.yaml

@@ -12,8 +12,6 @@ jobs:
     runs-on: ubuntu-latest
 
     permissions:
-      contents: write
-      id-token: write
       packages: write
 
     steps: