chore(deps): bump library/ubuntu from 24.04 to 26.04 in argocd-operator-util image (#2185)

Bumps library/ubuntu from 24.04 to 26.04.

---
updated-dependencies:
- dependency-name: library/ubuntu
  dependency-version: '26.04'
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build/util/Dockerfile

@@ -2,7 +2,7 @@
 FROM quay.io/argoproj/argocd@sha256:5d45dc6db21db32a0638ac9128462c6d9956a90fc81760146dada5a243ff7516 AS argocd
 
 # Final Image
-FROM docker.io/library/ubuntu:24.04
+FROM docker.io/library/ubuntu:26.04
 
 USER root