ci: update build matrix

Author: bitwalker

.github/workflows/elixir.yml

@@ -9,15 +9,20 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        otp: ['22.3', '23.2']
-        elixir: ['1.9.x', '1.10.x', '1.11.x']
+        otp: ['22.3', '23.3', '24.2']
+        elixir: ['1.9.x', '1.13.x']
+        include:
+        - otp: '24.2'
+          elixir: '1.13.x'
+          latest: true
     steps:
       - uses: actions/checkout@v2
       - uses: erlef/setup-beam@v1
         with:
           otp-version: ${{matrix.otp}}
           elixir-version: ${{matrix.elixir}}
       - run: mix deps.get
-      - run: mix format --check-formatted --dry-run
+      - if: ${{ matrix.latest }}
+        run: mix format --check-formatted --dry-run
       - run: mix test