update django url configuration after the removal of conf.urls.url in 4.0

Signed-off-by: Mattia Rizzolo <mattia@debian.org>

deploy/urls.py

-from django.conf.urls import url
+from django.conf.urls import path
 from . import views
 
 urlpatterns = [
-    url(r'^gitlab-pipeline-hook$', views.GitlabPipeline.as_view(), name="deploy_gitlab_pipeline_hook"),
+    path(r'^gitlab-pipeline-hook$', views.GitlabPipeline.as_view(), name="deploy_gitlab_pipeline_hook"),
 ]

dm/urls.py

 # coding: utf-8
 
-
-
-
-from django.conf.urls import url
+from django.conf.urls import path
 from django.views.generic import RedirectView
 from . import views
 
 urlpatterns = [
-    url(r'^$', RedirectView.as_view(url="/", permanent=True), name="dm_index"),
-    url(r'^claim$', views.Claim.as_view(), name="dm_claim"),
-    url(r'^claim/confirm/(?P<token>[^/]+)$', views.ClaimConfirm.as_view(), name="dm_claim_confirm"),
+    path('', RedirectView.as_view(url="/", permanent=True), name="dm_index"),
+    path('claim', views.Claim.as_view(), name="dm_claim"),
+    path('claim/confirm/<token>', views.ClaimConfirm.as_view(), name="dm_claim_confirm"),
 ]
-

keyring/urls.py

-from django.conf.urls import url
+from django.conf.urls import re_path
 from . import views
 
 
 urlpatterns = [
-    url(r'^keycheck/(?P<fpr>[0-9A-Fa-f]{32,40})$', views.Keycheck.as_view(), name="keyring_keycheck"),
+    re_path(r'^keycheck/(?P<fpr>[0-9A-Fa-f]{32,40})$', views.Keycheck.as_view(), name="keyring_keycheck"),
 ]

sitechecks/urls.py

-from django.conf.urls import url
+from django.conf.urls import path
 from . import views
 
 urlpatterns = [
-    url(r'^$', views.List.as_view(), name="sitechecks_list"),
+    path('', views.List.as_view(), name="sitechecks_list"),
 ]