Bump immutable from 5.1.4 to 5.1.5 in /packages/devextreme-themebuilder

Bumps [immutable](https://github.com/immutable-js/immutable-js) from 5.1.4 to 5.1.5.
- [Release notes](https://github.com/immutable-js/immutable-js/releases)
- [Changelog](https://github.com/immutable-js/immutable-js/blob/main/CHANGELOG.md)
- [Commits](immutable-js/immutable-js@v5.1.4...v5.1.5)

---
updated-dependencies:
- dependency-name: immutable
  dependency-version: 5.1.5
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/devextreme-themebuilder/package.json

@@ -50,7 +50,7 @@
     "express": "4.22.1",
     "filing-cabinet": "4.1.6",
     "fs-extra": "11.2.0",
-    "immutable": "5.1.4",
+    "immutable": "5.1.5",
     "precinct": "11.0.5",
     "sinon": "18.0.1",
     "ts-jest": "29.1.2",