Update Elixir and Erlang versions in CI (#151)

Author: whatyouhide

.github/workflows/ci.yml

@@ -19,18 +19,18 @@ jobs:
               elixir: "1.11"
               otp: "21.3"
           - pair:
-              elixir: 1.13.4
-              otp: 25.0.4
+              elixir: "1.16"
+              otp: "26.2"
             lint: lint
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: erlef/setup-beam@v1
         with:
           otp-version: ${{matrix.pair.otp}}
           elixir-version: ${{matrix.pair.elixir}}
 
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: |
             deps
@@ -39,7 +39,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-mix-
 
-      - run: mix deps.get
+      - run: mix deps.get --check-locked
 
       - run: mix format --check-formatted
         if: ${{ matrix.lint }}