chore: upgrade Elixir to 1.19

.devcontainer/Dockerfile

@@ -1,5 +1,5 @@
 # Use an official Elixir image as the base
-FROM elixir:1.18.3
+FROM elixir:1.19.3-otp-28
 
 # Set-up for switching to non-root user
 ARG USERNAME=vscode
@@ -51,4 +51,4 @@ RUN mix local.hex --force && mix local.rebar --force
 # Install Commitizen locally
 RUN pipx ensurepath \
 	&& pipx install commitizen \
-	&& pipx upgrade commitizen
+	&& pipx upgrade commitizen

.github/workflows/validate.yaml

@@ -42,8 +42,8 @@ jobs:
       # and running the workflow steps. These should match the versions in the
       # devcontainer Dockerfile.
       matrix:
-        otp: ['27.3.4']       # Define the OTP version [required]
-        elixir: ['1.18.3']    # Define the elixir version [required]
+        otp: ['28.1.1']       # Define the OTP version [required]
+        elixir: ['1.19.3']    # Define the elixir version [required]
     steps:
     # Step: Setup Elixir + Erlang image as the base.
     - name: Set up Elixir

README.md

@@ -31,7 +31,7 @@ If you want to go it alone, you'll need something along the following lines:
 
 Prerequisites:
 
-- Elixir 1.18.x
+- Elixir 1.19.x
   - Follow the [installation instructions](https://elixir-lang.org/install.html) to get
     this installed.
 - A Postgres database server

mix.exs

@@ -5,7 +5,7 @@ defmodule BathLARP.MixProject do
     [
       app: :bathlarp,
       version: "0.1.0",
-      elixir: "~> 1.18",
+      elixir: "~> 1.19",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
       aliases: aliases(),