CI: Use ARM runner, test Elixir 1.19, bump checkout v5, remove useless step

Author: badlop

.github/workflows/ci.yml

@@ -19,32 +19,24 @@ jobs:
   tests:
     name: Tests
     strategy:
-      fail-fast: false
       matrix:
-        elixir: ['1.14', '1.15', '1.16', '1.17', '1.18']
-    runs-on: ubuntu-24.04
+        elixir: ['1.14', '1.15', '1.16', '1.17', '1.18', '1.19']
+    runs-on: ubuntu-24.04-arm
     container:
       image: public.ecr.aws/docker/library/elixir:${{ matrix.elixir }}
 
     steps:
 
     - name: Checkout ejabberd
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         repository: processone/ejabberd
 
     - name: Checkout ejabberd-contrib
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         path: .ejabberd-modules/sources/ejabberd-contrib
 
-    - name: Get compatible Rebar3 binary when OTP 24
-      if: matrix.elixir < '1.14'
-      run: |
-        rm rebar3
-        wget https://github.com/processone/ejabberd/raw/24.12/rebar3
-        chmod +x rebar3
-
     - name: Prepare libraries
       run: |
         apt-get -qq update