chore(deps): update quay.io/keycloak/keycloak docker tag to v26.0.8 #6543

Job	Run time
check-auto-deploy	0s
talisman-check	0s
trivy-scan	14s
backend-jobs / setup-gradle	4s
frontend-jobs / analyze-frontend-with-sonar-cube	1m 48s
frontend-jobs / audit-licenses-frontend	14s
frontend-jobs / check-style-frontend	49s
frontend-jobs / test-frontend	50s
create-docker-image-job / create-docker-image	3m 0s
ldml-extension-jobs / test-ldml-extension	17s
e2e-tests (chromium) / e2e-tests	5m 19s
e2e-tests (firefox) / e2e-tests	6m 17s
e2e-tests (msedge) / e2e-tests	7m 38s
backend-jobs / backend-build	1m 14s
backend-jobs / analyze-backend-with-sonar-cube	5m 22s
backend-jobs / audit-licenses-backend	1m 51s
backend-jobs / backend-integration-tests	3m 26s
backend-jobs / backend-unit-tests	1m 38s
backend-jobs / generate-backend-code-documentation	56s
generate-test-reports	0s
push-docker-image-job	0s
push-reports	0s
deploy-staging-job	0s
deploy-uat-job	0s
deploy-production-job	0s
	40m 57s

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