Bump django from 2.2.3 to 2.2.4 in /requirements (#5224)

Bumps [django](https://github.com/django/django) from 2.2.3 to 2.2.4.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.3...2.2.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements/common.txt

@@ -39,9 +39,9 @@ Brotli==1.0.7 \
     --hash=sha256:113f51658e6fe548dce4b3749f6ef6c24de4184ba9c10a909cbee4261c2a5da0 \
     --hash=sha256:0538dc1744fd17c314d2adc409ea7d1b779783b89fd95bcfb0c2acc93a6ea5a7
 
-Django==2.2.3 \
-    --hash=sha256:6e974d4b57e3b29e4882b244d40171d6a75202ab8d2402b8e8adbd182e25cf0c \
-    --hash=sha256:4d23f61b26892bac785f07401bc38cbf8fa4cec993f400e9cd9ddf28fd51c0ea
+Django==2.2.4 \
+    --hash=sha256:9a2f98211ab474c710fcdad29c82f30fc14ce9917c7a70c3682162a624de4035 \
+    --hash=sha256:16a5d54411599780ac9dfe3b9b38f90f785c51259a584e0b24b6f14a7f69aae8
 
 celery==4.3.0 --hash=sha256:528e56767ae7e43a16cfef24ee1062491f5754368d38fcfffa861cdb9ef219be --hash=sha256:4c4532aa683f170f40bd76f928b70bc06ff171a959e06e71bf35f2f9d6031ef9