chore: upgrade Ory ecosystem dependencies to v25.4.0

- Upgrade ory/client-go to v1.22.26
- Upgrade ory/hydra, ory/kratos, ory/keto to v25.4.0 pseudo-versions
- Update ory/keto/proto replace directive to v25.4.0 bundled version
- Add ory/x replace directive pinned to v25.4.0 bundled version
- Remove fosite replace directive (no longer needed)
- Bump go version to 1.26
- Update various transitive dependencies

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aeneasr