build(deps-dev): bump @babel/plugin-transform-private-methods

Bumps [@babel/plugin-transform-private-methods](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-transform-private-methods) from 7.28.6 to 8.0.1.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v8.0.1/packages/babel-plugin-transform-private-methods)

---
updated-dependencies:
- dependency-name: "@babel/plugin-transform-private-methods"
  dependency-version: 8.0.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

build/frontend-legacy/package-lock.json

@@ -96,7 +96,7 @@
   },
   "devDependencies": {
     "@babel/node": "^7.29.0",
-    "@babel/plugin-transform-private-methods": "^7.28.6",
+    "@babel/plugin-transform-private-methods": "^8.0.1",
     "@babel/preset-typescript": "^7.29.7",
     "@nextcloud/babel-config": "^1.3.0",
     "@nextcloud/typings": "^1.10.0",