backstage release v2.91.1-rc.4

Changed

• (deps) Update tanstack-query monorepo to v5.104.0 in #2703 by @renovate[bot]
• (deps) Update dependency @ai-sdk/openai-compatible to v3.0.53 in #2731 by @renovate[bot]
• (deps) Update dependency tsx to v4.23.15 in #2732 by @renovate[bot]
• (deps) Update @giantswarm/k8s-types to v0.10.0 in #2734 by @teemow

Full Changelog: https://github.com/giantswarm/backstage/compare/v2.91.0...v2.91.1-rc.4