[8.18] Update dependency @elastic/charts to v68.1.1 to fix partition nested tooltip colors (#236336)

fix #203021

The tooltip no longer shows wrong color for nested slices. This issue
was caused when nested layers shared the same label and value.

## Summary

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [@elastic/charts](https://togithub.com/elastic/elastic-charts) |
dependencies | patch | [`68.1.0` ->
`68.1.1`](elastic/elastic-charts@v68.1.0...v68.1.1)
|

---

### Release Notes

##
[68.1.1](elastic/elastic-charts@v68.1.0...v68.1.1)
(2025-09-24)


### Bug Fixes

* **partition:** fix tooltip nested colors
([#2717](elastic/elastic-charts#2717)) [68.x]
([#2738](elastic/elastic-charts#2738))
([c9b995f](elastic/elastic-charts@c9b995f))

#
[68.1.0](elastic/elastic-charts@v68.0.4...v68.1.0)
(2025-01-13)
---

### Checklist
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)
- [ ] Review the [backport
guidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)
and apply applicable `backport:*` labels.

Author: andrimal

package.json

@@ -114,7 +114,7 @@
     "@elastic/apm-rum": "^5.16.3",
     "@elastic/apm-rum-core": "^5.22.1",
     "@elastic/apm-rum-react": "^2.0.5",
-    "@elastic/charts": "68.1.0",
+    "@elastic/charts": "68.1.1",
     "@elastic/datemath": "5.0.3",
     "@elastic/ebt": "^1.1.1",
     "@elastic/ecs": "^8.11.5",

yarn.lock

@@ -2200,10 +2200,10 @@
   dependencies:
     object-hash "^1.3.0"
 
-"@elastic/[email protected].0":
-  version "68.1.0"
-  resolved "https://registry.yarnpkg.com/@elastic/charts/-/charts-68.1.0.tgz#7c2e471e984cb8cfe9a05dba8eda19ff26a880e7"
-  integrity sha512-4Wb0g9lgEpsgKJgdV6uqmY444elBJ5VhVJQ0ZUpnn8CV9mzEz8HqXAanpfqG9NTGca8C/EnwlSeQEgF+9orU4A==
+"@elastic/[email protected].1":
+  version "68.1.1"
+  resolved "https://registry.yarnpkg.com/@elastic/charts/-/charts-68.1.1.tgz#b05ec81bb9998bb183993e1256d9b05786fe75df"
+  integrity sha512-ASSsqGw6jDuk84u8jvF7x9FdtHr7YVMWElQDBGFXOLPhCZt+14UTsQqyLIpevMVZo/aCh03RHzRhrlYH//yGaA==
   dependencies:
     "@popperjs/core" "^2.11.8"
     bezier-easing "^2.1.0"