fix-permissions-adding-page

[jrief]

Description

This makes djangocms-versioning compatible with upcoming release django-CMS version 4.2

Related resources

In django-CMS develop-4 branch, model Page and TreeNode have been merged. Therefore the request parameter parent_node=… must be replaced by parent_page=….

Checklist

• [x] I have opened this pull request against master
• [ ] I have added or modified the tests when changing logic
• [x] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [x] I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.08%. Comparing base (f90c5b2) to head (6976570). Report is 23 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #419 +/- ## ========================================== + Coverage 90.88% 91.08% +0.19% ========================================== Files 72 72 Lines 2546 2624 +78 Branches 361 380 +19 ========================================== + Hits 2314 2390 +76 Misses 168 168 - Partials 64 66 +2 ```

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