chore(deps): update ubuntu docker tag to v26

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
         include:
           - name: ubuntu
             image-name: python-base-ubuntu
-            from: ubuntu:24.04@sha256:786a8b558f7be160c6c8c4a54f9a57274f3b4fb1491cf65146521ae77ff1dc54
+            from: ubuntu:26.04@sha256:f3d28607ddd78734bb7f71f117f3c6706c666b8b76cbff7c9ff6e5718d46ff64
           - name: ubuntu-cloud-archive
             image-name: python-base-ubuntu-cloud-archive
             from: ghcr.io/vexxhost/ubuntu-cloud-archive:2024.2@sha256:2583d6e294db952c74b65c202febde1c54dcf6faefc27f1737bc50505e05237b