Bump angular-split from 18.0.0 to 20.0.0

Bumps [angular-split](https://github.com/angular-split/angular-split) from 18.0.0 to 20.0.0.
- [Release notes](https://github.com/angular-split/angular-split/releases)
- [Changelog](https://github.com/angular-split/angular-split/blob/main/CHANGELOG.md)
- [Commits](angular-split/angular-split@v18.0.0...v20.0.0)

---
updated-dependencies:
- dependency-name: angular-split
  dependency-version: 20.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/altair-app/package.json

@@ -50,7 +50,7 @@
     "ajv": "^8.11.2",
     "altair-graphql-core": "workspace:*",
     "angular-resizable-element": "^6.0.0",
-    "angular-split": "^18.0.0",
+    "angular-split": "^20.0.0",
     "apollo-cache-inmemory": "1.6.6",
     "apollo-link": "1.2.14",
     "apollo-link-http": "1.5.17",