feat: Upgrade Keycloak to v26 #435

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Status	Duration	Name
✅ Succeeded	6 seconds	init
✅ Succeeded	12 seconds	clone-repository
✅ Succeeded	8 seconds	prefetch-dependencies
✅ Succeeded	8 minutes	build-container-arm64
✅ Succeeded	2 minutes	build-container-amd64
✅ Succeeded	11 seconds	build-container
✅ Succeeded	46 seconds	ecosystem-cert-preflight-checks
✅ Succeeded	22 seconds	sast-snyk-check
✅ Succeeded	11 seconds	rpms-signature-scan
✅ Succeeded	8 seconds	apply-tags
✅ Succeeded	9 seconds	deprecated-base-image-check
✅ Succeeded	1 minute	clamav-scan
✅ Succeeded	36 seconds	build-source-image
✅ Succeeded	46 seconds	clair-scan
✅ Succeeded	7 seconds	push-dockerfile
✅ Succeeded	8 seconds	show-sbom
✅ Succeeded	9 seconds	show-summary