[CT-3393] Unpin ddtrace in dev-requirements

### Housekeeping

- [X] I am a maintainer of dbt-core

### Short description

We pinned ddtrace in dev-requirements in #9090 to resolve a windows error from the 2.2.0 release of ddtrace.

### Acceptance criteria

ddtrace is unpinned (or pinned to 2.2.0)

### Impact to Other Teams

None

### Will backports be required?

Yes.
1.7.latest
1.6.latest
1.5.latest
1.3.latest
1.2.latest

### Context

To keep ddtrace up to date.

TODO: whate kind of fixes in 2.2.0? How urgent is this once they release a fix?