Bump workflows to Ubuntu 26.04 (#74)

Author: IsaacG

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ on:
 jobs:
   build:
     name: Tests
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     steps:
       - name: Checkout code
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd