Upgrade dependencies

requirements.txt

@@ -3,11 +3,11 @@ attrs==19.1.0
 beautifulsoup4==4.7.1
 bleach==3.1.0
 blinker==1.4
-boto3==1.9.142
-botocore==1.12.142
+boto3==1.9.156
+botocore==1.12.156
 certifi==2019.3.9
 chardet==3.0.4
-ddtrace==0.24.0
+ddtrace==0.25.0
 defusedxml==0.6.0
 Django==2.2.1
 django-allauth==0.39.1
@@ -29,14 +29,14 @@ python3-openid==3.1.0
 pytz==2019.1
 raven==6.10.0
 redis==3.2.1
-requests==2.21.0
+requests==2.22.0
 requests-oauthlib==1.2.0
 s3transfer==0.2.0
 six==1.12.0
 soupsieve==1.9.1
 spinach==0.0.9
 sqlparse==0.3.0
-urllib3==1.24.2
+urllib3==1.25.2
 waitress==1.3.0
 webencodings==0.5.1
 whitenoise==4.1.2