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@sha256:5e275723f82c67e387ba9e3c24baa0abdcb268917f276a0561c97bef9450d0b4
           - name: ubuntu-cloud-archive
             image-name: python-base-ubuntu-cloud-archive
             from: ghcr.io/vexxhost/ubuntu-cloud-archive:2026.1@sha256:2e655a7437a95ebb4065b5328e916195e39a79449c8593af015acfc67b2fdfb9