Drop support for React 18

[nstepien]

https://react.dev/blog/2024/12/05/react-19
https://react.dev/blog/2024/04/25/react-19-upgrade-guide
https://github.com/facebook/react/blob/main/CHANGELOG.md

TODO:

• remove overrides in package.json
• update repo CI settings after merging

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.59%. Comparing base (1abde2f) to head (24275b6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3503      +/-   ##
==========================================
- Coverage   98.66%   98.59%   -0.07%     
==========================================
  Files          48       47       -1     
  Lines        3444     3425      -19     
  Branches      743      741       -2     
==========================================
- Hits         3398     3377      -21     
- Misses         46       48       +2     

Files with missing lines	Coverage Δ
src/Cell.tsx	100.00% <100.00%> (ø)
src/DataGrid.tsx	99.78% <100.00%> (+<0.01%)	⬆️
src/DataGridDefaultRenderersContext.ts	100.00% <100.00%> (ø)
src/DragHandle.tsx	98.90% <ø> (ø)
src/EditCell.tsx	98.13% <100.00%> (ø)
src/GroupRow.tsx	100.00% <100.00%> (ø)
src/HeaderCell.tsx	97.28% <100.00%> (ø)
src/Row.tsx	100.00% <100.00%> (ø)
src/ScrollToCell.tsx	100.00% <100.00%> (ø)
src/TreeDataGrid.tsx	95.19% <100.00%> (-0.08%)	⬇️
... and 9 more

... and 1 file with indirect coverage changes

[amanmahajan7]