fix: Add `dir` attribute to `html` tag in `djangocms_frontend.html`

[sakhawy]

Description

Added dir attribute to the html tag for #7871 to take effect.

Related resources

• #7871 to take effect.
• #7863

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 86.91%. Comparing base (f11feee) to head (1605b63). Report is 14 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #204 +/- ## ========================================== - Coverage 86.93% 86.91% -0.02% ========================================== Files 120 120 Lines 3107 3119 +12 Branches 330 331 +1 ========================================== + Hits 2701 2711 +10 + Misses 304 303 -1 - Partials 102 105 +3 ```

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