Update debater-python-api requirement from ~=3.5 to ~=4.3

Updates the requirements on [debater-python-api]() to permit the latest version.

---
updated-dependencies:
- dependency-name: debater-python-api
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -23,7 +23,7 @@ dependencies = [
     "trectools~=0.0.49",
     "faiss-cpu~=1.7",  # Needed for pyserini >= 0.14.0
     "torch~=2.2",  # Needed for pyserini >= 0.14.0
-    "debater-python-api~=3.5",
+    "debater-python-api~=4.3",
     "dataclasses-json~=0.6.4",
     "pandas~=1.5",
     "pymagnitude~=0.1.143",