remove backport reference

Author: adorton-adobe

.build/pre_build.py

@@ -23,7 +23,7 @@
 import json
 import pkg_resources
 from pathlib import Path
-from backports import configparser
+import configparser
 
 
 def cd():

tests/test_flags.py

@@ -20,7 +20,7 @@
 
 import os
 import pytest
-from backports import configparser
+import configparser
 from user_sync import resource
 from user_sync import flags
 

user_sync/flags.py

@@ -18,7 +18,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 import os
-from backports import configparser
+import configparser
 from user_sync import resource
 
 _config = {}