Fix incorrect sdist filename

This broke building packages with dashes in their names from source,
including this one.

As of a recent release of `setuptools`, sdist filenames now are in the
format `package_name-<version>.tar.gz` instead of
`package-name-<version>.tar.gz` (i.e. underscores in the package name
instead of dashes). This is the case even if the package name itself
has dashes in it.

pypa/setuptools#4214

pypa/setuptools#4167

This change is seemingly deliberate in order to conform to a standard
for filenames specifically even though the standard for project names
is increasingly to use dashes.

setuptools_conda/setuptools_conda.py

@@ -649,7 +649,7 @@ def run(self):
         if self.from_wheel or self.from_downloaded_wheel:
             dist = [p for p in os.listdir(self.build_dir) if p.endswith('.whl')][0]
         else:
-            dist = f'{self.distribution.get_name()}-{self.VERSION}.tar.gz'
+            dist = f'{self.distribution.get_fullname()}.tar.gz'
 
         with open(os.path.join(self.build_dir, dist), 'rb') as f:
             sha256 = hashlib.sha256(f.read()).hexdigest()