Update versions in CI

.github/workflows/ci.yml

@@ -8,39 +8,40 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ${{ matrix.os }}
     env:
       MIX_ENV: test
     strategy:
       fail-fast: false
       matrix:
         include:
-          - pair:
-              elixir: 1.11
-              otp: 23.3
-          - pair:
-              elixir: 1.16
-              otp: 26.2
+          # Oldest.
+          - elixir: "1.11"
+            otp: "23.3"
+            os: ubuntu-20.04
+
+          # Newest.
+          - elixir: "1.17"
+            otp: "27.0"
             lint: lint
+            os: ubuntu-latest
+
     steps:
       - uses: actions/checkout@v4
 
       - uses: erlef/setup-beam@v1
         with:
-          otp-version: ${{matrix.pair.otp}}
-          elixir-version: ${{matrix.pair.elixir}}
+          otp-version: ${{ matrix.otp }}
+          elixir-version: ${{ matrix.elixir }}
 
-      - name: Install Dependencies
-        run: mix deps.get --only test
+      - run: mix deps.get --only test
 
       - run: mix format --check-formatted
         if: ${{ matrix.lint }}
 
-      - run: mix deps.get && mix deps.unlock --check-unused
+      - run: mix do deps.get, deps.unlock --check-unused
         if: ${{ matrix.lint }}
 
-      - run: mix deps.compile
-
       - run: mix compile --warnings-as-errors
         if: ${{ matrix.lint }}