build(deps): bump @tanstack/react-virtual from 3.13.19 to 3.13.21 in /ui (#2380)

Bumps [@tanstack/react-virtual](https://github.com/TanStack/virtual/tree/HEAD/packages/react-virtual) from 3.13.19 to 3.13.21.
- [Release notes](https://github.com/TanStack/virtual/releases)
- [Changelog](https://github.com/TanStack/virtual/blob/main/packages/react-virtual/CHANGELOG.md)
- [Commits](https://github.com/TanStack/virtual/commits/@tanstack/react-virtual@3.13.21/packages/react-virtual)

---
updated-dependencies:
- dependency-name: "@tanstack/react-virtual"
  dependency-version: 3.13.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

ui/package-lock.json

@@ -26,7 +26,7 @@
     "@patternfly/react-user-feedback": "^6.2.0",
     "@stdlib/string-truncate": "^0.2.3",
     "@stdlib/string-truncate-middle": "^0.2.3",
-    "@tanstack/react-virtual": "^3.13.19",
+    "@tanstack/react-virtual": "^3.13.21",
     "@types/js-yaml": "^4.0.9",
     "@types/node": "25.3.5",
     "@types/react": "18.3.12",