dependabot is failing

See [here](https://github.com/elastic/apm-agent-python/actions/runs/11248516257/job/31273784137#step:3:71)

```
Dependabot can't update vulnerable dependencies without a lockfile
The currently installed version can't be determined.

To resolve the issue add a supported lockfile (Pipfile.lock, pyproject.lock or poetry.lock).
```

and

```
proxy | 2024/10/09 04:59:47 [015] GET [https://pypi.org:443/simple/django/](https://pypi.org/simple/django/)
proxy | 2024/10/09 04:59:47 [015] 200 [https://pypi.org:443/simple/django/](https://pypi.org/simple/django/)
updater | 2024/10/09 04:59:47 INFO Filtered out 4 yanked versions
updater | 2024/10/09 04:59:47 INFO Latest version is 5.1.2
updater | 2024/10/09 04:59:47 INFO Dependabot can't update vulnerable dependencies for projects without a lockfile or pinned version requirement as the currently installed version of django isn't known.
proxy | 2024/10/09 04:59:48 [019] POST /update_jobs/898200968/record_update_job_error
proxy | 2024/10/09 04:59:48 [019] 204 /update_jobs/898200968/record_update_job_error
proxy | 2024/10/09 04:59:48 [021] PATCH /update_jobs/898200968/mark_as_processed
proxy | 2024/10/09 04:59:48 [021] 204 /update_jobs/898200968/mark_as_processed
updater | 2024/10/09 04:59:48 INFO Finished job processing
updater | 2024/10/09 04:59:48 INFO Results:
Dependabot encountered '1' error(s) during execution, please check the logs for more details.
+-------------------------------+
| Errors |
+-------------------------------+
| dependency_file_not_supported |
+-------------------------------+
Failure running container 2c5d1c36c565c[53](https://github.com/elastic/apm-agent-python/actions/runs/11248516257/job/31273784137#step:3:55)e22f55c108d9f5d3ce9ca87b269cfcdf12f92aa89569091d4
Cleaned up container 2c5d1c36c565c53e22f55c108d9f5d3ce9ca87b269cfcdf12f92aa89569091d4
proxy | 2024/10/09 04:59:48 Posting metrics to remote API endpoint
2024/10/09 04:59:48 0/9 calls cached (0%)
Error: Dependabot encountered an error performing the update

Error: The updater encountered one or more errors.
```