Update-to-erlang-29.0.4

[conradwt]

This PR supports the following features:

• update to Erlang 29.0.4
• update Hex packages

[github-actions]

Docker image tag(s) pushed:

ghcr.io/conradwt/zero-to-graphql-using-elixir:gha-30604956546
ghcr.io/conradwt/zero-to-graphql-using-elixir:pr-322 

Labels added to images:

org.opencontainers.image.created=2026-07-31T04:47:18.564Z
org.opencontainers.image.description=The purpose of this example is to provide details as to how one would go about using GraphQL with the Elixir Language.
org.opencontainers.image.licenses=MIT
org.opencontainers.image.revision=d1df2883eee9c1c627e9b3635e79d5888a49fea2
org.opencontainers.image.source=https://github.com/conradwt/zero-to-graphql-using-elixir
org.opencontainers.image.title=zero-to-graphql-using-elixir
org.opencontainers.image.url=https://github.com/conradwt/zero-to-graphql-using-elixir
org.opencontainers.image.version=gha-30604956546