feat: bump Osmosis version running tests (#471)

* Use Cosmos Nix branch to bump Osmosis from v28 to v30.0.1

* Trigger Hermes CI jobs when updating flake.lock

* Use main branch of Cosmos Nix

Author: ljoss17

.github/workflows/hermes.yaml

@@ -8,6 +8,7 @@ on:
       - light-client/**
       - attestator/**
       - .github/workflows/hermes.yaml
+      - flake.lock
   push:
     branches:
       - main