Add info about new release 3.9.2 (mongodb#2440)

* Add info about new release 3.9.2

* chore: update changelog

Co-authored-by: Divine <[email protected]>

chore: update changelog

Merge pull request mongodb#2365 from jenssegers/update-changelog

chore: update changelog and prepare release

Merge pull request mongodb#2344 from divine/l9

feat: initial laravel 9 compatibility

Merge pull request mongodb#2263 from divine/fix-getrelation

[3.8] Fix getRelationQuery breaking changes

Merge pull request mongodb#2204 from jenssegers/query-builder-revert

[3.8] Fix query builder regressions

Fix query builder regressions

This reverts back mongodb#2020 and mongodb#2127. See explanation here: mongodb#2203

Fix query builder regressions

This reverts back mongodb#2020 and mongodb#2127. See explanation here: mongodb#2203

Merge pull request mongodb#2150 from divine/php8

[3.8] Add PHP 8 to matrix

update changelog