Updating pillow and other minor packages.

requirements.txt

 # Monitor dependencies
-scout-apm==2.14.3
-sentry-sdk==0.15.1
+scout-apm==2.15.2
+sentry-sdk==0.16.2
 
 # Production dependencies
 boto3==1.13.16
@@ -33,11 +33,11 @@ mailchimp3==3.0.14
 mistune==0.8.4
 more-itertools==8.4.0
 phonenumberslite==8.12.6
-Pillow==6.2.2
+Pillow==7.2.0
 psycopg2==2.8.5
 reportlab==3.5.34
 social_auth_app_django==3.1.0
 tomd==0.1.3
 wagtail==2.9.3
-wagtail-cache==1.0.0
+wagtail-cache==1.0.1
 whitenoise==5.1.0