Update ddtrace requirement from ~=1.20 to ~=2.1 (#989)

* Update ddtrace requirement from ~=1.20 to ~=2.1

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@v1.20.0...v2.1.3)

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

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

* Add automated changelog yaml from template for bot PR

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Github Build Bot <[email protected]>
Co-authored-by: Mike Alfare <[email protected]>

Author: 3 people

.changes/unreleased/Dependencies-20231027-201709.yaml

@@ -0,0 +1,6 @@
+kind: "Dependencies"
+body: "Update ddtrace requirement from ~=1.20 to ~=2.1"
+time: 2023-10-27T20:17:09.00000Z
+custom:
+  Author: dependabot[bot]
+  PR: 989

dev-requirements.txt

@@ -8,7 +8,7 @@ git+https://github.com/dbt-labs/dbt-core.git#egg=dbt-tests-adapter&subdirectory=
 black~=23.10
 bumpversion~=0.6.0
 click~=8.1
-ddtrace~=1.20
+ddtrace~=2.1
 flake8~=6.1
 flaky~=3.7
 freezegun~=1.2