Remove third_party_dev.txt deps (already referenced in edc.txt)

Author: JonathanWillitts

pyproject.toml

@@ -56,7 +56,6 @@ deps =
     -r https://raw.githubusercontent.com/clinicedc/edc/develop/requirements.tests/tox.txt
     -r https://raw.githubusercontent.com/clinicedc/edc/develop/requirements.tests/test_utils.txt
     -r https://raw.githubusercontent.com/clinicedc/edc/develop/requirements.tests/edc.txt
-    -r https://raw.githubusercontent.com/clinicedc/edc/develop/requirements.tests/third_party_dev.txt
     dj51: Django>=5.1,<5.2
     djdev: https://github.com/django/django/tarball/main