BUG: Fixed reference of value with str.__new__ in TextStringObject

[thomas-forte]

based on comments from #2949

• Fixing reference of value with str.new output
• updated type annotation on update_page_form_field_values

[codecov[bot]]

Codecov Report

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

Project coverage is 96.36%. Comparing base (5587414) to head (945a2a4). Report is 6 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2952 +/- ## ======================================= Coverage 96.36% 96.36% ======================================= Files 52 52 Lines 8745 8745 Branches 1589 1589 ======================================= Hits 8427 8427 Misses 190 190 Partials 128 128 ```

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[stefan6419846]

Could you please add a test which shows why this change is necessary?