Update ddtrace requirement from ~=2.7.0 to ~=2.8.3

Updates the requirements on [ddtrace](https://github.com/DataDog/dd-trace-py) to permit the latest version.
- [Release notes](https://github.com/DataDog/dd-trace-py/releases)
- [Changelog](https://github.com/DataDog/dd-trace-py/blob/main/CHANGELOG.md)
- [Commits](DataDog/dd-trace-py@v2.7.0...v2.8.3)

---
updated-dependencies:
- dependency-name: ddtrace
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -17,5 +17,5 @@ django-storages~=1.13
 gunicorn~=21.2.0
 psycopg2-binary~=2.9.5
 sentry-sdk~=1.44.0
-ddtrace~=2.7.0
+ddtrace~=2.8.3
 setproctitle~=1.3.2