ci: update matrix

Author: bitwalker

.github/workflows/elixir.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        otp: ['25', 'latest']
+        otp: ['26', 'latest']
         elixir: ['1.17', '1.18', 'latest']
     steps:
       - uses: actions/checkout@v4