Update to Elixir 1.19.5.

[conradwt]

This PR supports the following features:

• update to Elixir 1.19.5

[github-actions]

Docker image tag(s) pushed:

ghcr.io/conradwt/zero-to-graphql-using-elixir:gha-20874964587
ghcr.io/conradwt/zero-to-graphql-using-elixir:pr-296 

Labels added to images:

org.opencontainers.image.created=2026-01-10T07:32:47.492Z
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=ed729f81f4151901f2f5ce61b42c83098045464c
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-20874964587