Remove nightly release fossil

setup.py

 #!/usr/bin/env python
-import os
-
 import numpy
 from setuptools import Extension, setup
 from setuptools.dist import Distribution
@@ -14,22 +12,6 @@ dist.parse_config_files()
 
 NAME: str = dist.get_name()  # type: ignore
 
-# Handle builds of nightly release
-if "BUILD_PYTENSOR_NIGHTLY" in os.environ:
-    NAME += "-nightly"
-
-    from versioneer import get_versions as original_get_versions
-
-    def get_versions():
-        from datetime import datetime, timezone
-
-        suffix = datetime.now(timezone.utc).strftime(r".dev%Y%m%d")
-        versions = original_get_versions()
-        versions["version"] = versions["version"].split("+")[0] + suffix
-        return versions
-
-    versioneer.get_versions = get_versions
-
 
 if __name__ == "__main__":
     setup(