chore(deps): update ubuntu docker tag to v26 (main)

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
ubuntu (source)	final	major	25.04 → 26.04
ubuntu (source)	final	major	23.10 → 26.04

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[forking-renovate]

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Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 26.x releases. But if you manually upgrade to 26.x then Renovate will re-enable minor and patch updates automatically.

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