Build on the latest Elixir/Erlang

Author: sasa1977

.github/workflows/boundary.yaml

@@ -12,10 +12,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: erlef/setup-elixir@v1
+      - uses: erlef/setup-beam@v1
         with:
-          otp-version: 26.0
-          elixir-version: 1.15.4
+          otp-version: 28.0
+          elixir-version: 1.18.4
 
       - name: Restore cached deps
         uses: actions/cache@v4