chore(deps): update docker.io/eclipse-temurin docker tag to v26

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/eclipse-temurin	final	major	25-jre → 26-jre
docker.io/eclipse-temurin	stage	major	25-jdk → 26-jdk

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[coopernetes]

This project is staying on Java 25 (LTS).

[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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