Move backoff dep to primary deps

pyproject.toml

@@ -37,6 +37,7 @@ classifiers = [
 dynamic = ["version"]
 dependencies = [
   "aiohttp>=3.8.1",
+  "backoff>=2.2",
   "dataclasses-json>=0.5",
   "fireo>=1.5",
   "fsspec",  # Version pin set by gcsfs
@@ -56,7 +57,6 @@ Documentation = "https://CouncilDataProject.github.io/cdp-backend"
 # https://peps.python.org/pep-0621/#dependencies-optional-dependencies
 [project.optional-dependencies]
 pipeline = [
-  "backoff>=2.2",
   "dask[distributed]>=2021.7.0",
   # We can't ship faster-whisper until they release a pypi package
   # Install will have to make it a separate command