Bump dependency versions.

requirements.txt

@@ -1,5 +1,5 @@
 coverage==5.5
-pytz==2021.1
+pytz==2023.3
 django==2.2.28
 django-dotenv==1.4.2
 django-debug-toolbar==3.2.1
@@ -10,17 +10,17 @@ django-maintenance-mode==0.15.1
 django-pipeline==2.0.6
 django-cors-headers==3.7.0
 celery[redis]==5.3.6
-django-redis==4.12.1
+django-redis==5.4.0
 statsd==3.3.0
 datadog==0.40.1
-boto==2.49.0
-twilio==6.53.0
+boto3==1.33.7
+twilio==8.10.3
 pyOpenSSL==20.0.1
 Pillow==10.1.0
 icalendar==4.0.7
 python-dateutil==2.8.2
 mock==4.0.3
-mysqlclient==2.0.3
+mysqlclient==2.2.0
 coreapi==2.3.3
 Pygments==2.17.2
 Markdown==3.3.4