Update ddtrace requirement from ~=1.18 to ~=1.19

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/2.x/CHANGELOG.md)
- [Commits](DataDog/dd-trace-py@v1.18.0...v1.19.0)

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

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

dev-requirements.txt

@@ -8,7 +8,7 @@ git+https://github.com/dbt-labs/dbt-core.git#egg=dbt-tests-adapter&subdirectory=
 black~=23.9
 bumpversion~=0.6.0
 click~=8.1
-ddtrace~=1.18
+ddtrace~=1.19
 flake8~=6.1
 flaky~=3.7
 freezegun~=1.2