Update quay.io/keycloak/keycloak Docker tag to v26.0.8 #927

Job	Run time
update-version	22s
get-e2e-files	4s
build-docker-image	2m 1s
e2e-docker (check-in.cy.ts)	2m 4s
e2e-docker (duplicate-objective.cy.ts)	1m 57s
e2e-docker (key-result.cy.ts)	2m 29s
e2e-docker (login.cy.ts)	1m 47s
e2e-docker (objective-backlog.cy.ts)	2m 23s
e2e-docker (objective-crud.cy.ts)	2m 3s
e2e-docker (objective.cy.ts)	2m 7s
e2e-docker (overview.cy.ts)	1m 38s
e2e-docker (routing.cy.ts)	2m 14s
e2e-docker (scoring.cy.ts)	3m 9s
e2e-docker (tab.cy.ts)	2m 41s
e2e-docker (team-management.cy.ts)	3m 1s
e2e-docker (team.cy.ts)	2m 20s
e2e-docker (teammanagement.cy.ts)	1m 23s
upload-to-quay	42s
sonarqube	3m 30s
generate-and-push-sbom	27s
	38m 22s

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