Update CI (#86)

Author: josevalim

.github/workflows/ci.yml

@@ -6,18 +6,18 @@ on:
       - master
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     name: OTP ${{matrix.otp}} / Elixir ${{matrix.elixir}}
     env:
       MIX_ENV: test
     strategy:
       fail-fast: false
       matrix:
         include:
-          - elixir: 1.11.4
-            otp: 23.3
-          - elixir: 1.17.1
-            otp: 27.0
+          - elixir: 1.14
+            otp: 24.3
+          - elixir: 1.18
+            otp: 27.3
             lint: true
     steps:
       - uses: actions/checkout@v4