update min configobj version

certbot/setup.py

@@ -40,7 +40,7 @@ install_requires = [
     # saying so here causes a runtime error against our temporary fork of 0.9.3
     # in which we added 2.6 support (see #2243), so we relax the requirement.
     'ConfigArgParse>=0.9.3',
-    'configobj',
+    'configobj>=5.0.6',
     'cryptography>=2.1.4',
     'distro>=1.0.1',
     # 1.1.0+ is required to avoid the warnings described at

tools/oldest_constraints.txt

@@ -15,7 +15,6 @@
 # initially referred to the Python 2 packages in CentOS/RHEL 7 with EPEL.
 cffi==1.9.1
 chardet==2.2.1
-configobj==4.7.2
 ipaddress==1.0.16
 mock==1.0.1
 ndg-httpsclient==0.3.2
@@ -70,6 +69,9 @@ httplib2==0.9.2
 idna==2.6
 setuptools==39.0.1
 
+# Ubuntu Focal constraints
+configobj==5.0.6
+
 # Plugin constraints
 # These aren't necessarily the oldest versions we need to support
 # Tracking at https://github.com/certbot/certbot/issues/6473