Bump Ubuntu version

Author: StanFromIreland

.github/workflows/build.yml

@@ -388,7 +388,7 @@ jobs:
     if: needs.build-context.outputs.run-ubuntu == 'true'
     uses: ./.github/workflows/reusable-install.yml
     with:
-      os: ubuntu-24.04-arm
+      os: ubuntu-26.04-arm
 
   test-hypothesis:
     name: "Hypothesis tests on Ubuntu"