news: Added bugfix entry for syslog-ng#5257

Signed-off-by: Bálint Horváth <[email protected]>

Author: therandomstring

news/bugfix-5257.md

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+`s3`: Bugfixes and general stability improvements for the `s3` destination driver
+
+Refactored the python `s3` destination driver to fix a major bug causing data loss if multithreaded upload was 
+enabled via the `upload-threads` option.
+
+This pull request also
+* Fixes another bug generic to all python drivers, causing syslog-ng to intermittently crash if stopped by `SIGINT`.
+* Adds a new suffix option to the `s3` destination driver. The default suffix is `.log`, denoting file extension.
+* Removes more than 600 lines of superfluous code.
+* Brings major stability improvements to the `s3` driver.
+
+**Important:**
+* This change affects the naming of multipart objects, as the sequence index is moved in front of the suffix.
+* The `upload-threads` option is changed to act on a per-object basis, changing the maximum thread count 
+dependent on `max-pending-uploads * upload-threads`.