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

@@ -21,7 +21,7 @@ jobs:
         include:
           - name: ubuntu
             image-name: python-base-ubuntu
-            from: ubuntu:24.04@sha256:c4a8d5503dfb2a3eb8ab5f807da5bc69a85730fb49b5cfca2330194ebcc41c7b
+            from: ubuntu:26.04@sha256:f3d28607ddd78734bb7f71f117f3c6706c666b8b76cbff7c9ff6e5718d46ff64
           - name: ubuntu-cloud-archive
             image-name: python-base-ubuntu-cloud-archive
             from: ghcr.io/vexxhost/ubuntu-cloud-archive:2026.1@sha256:016c17d69827bd8d62956edc964427cc8a1da67080bd46318fc7dce351709ce5