* fix(release): add Nix package steps to release molecule
Add missing Nix support to the release workflow:
- bump-default-nix: Updates version in default.nix
- update-vendorhash: Prompts to update vendorHash if go.mod changed
- Add default.nix to verify-versions check
This was lost when bump-version.sh was replaced with the molecule
workflow in 39dbe90a. The original Nix support from c802f27f included
vendorHash detection in bump-version.sh, but that logic was not
migrated to the new workflow.
Fixes#1107
* fix(nix): update vendorHash for current go.mod
68403ae631