chore(deps): update quay.io/keycloak/keycloak docker tag to v26

[renovate]

This PR contains the following updates:

Package	Update	Change
quay.io/keycloak/keycloak	major	15.1.1 -> 26.0.6
quay.io/keycloak/keycloak	major	21.1.2 -> 26.0.6

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[github-actions]

🦙 MegaLinter status: ❌ ERROR

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