Bump django from 2.2.18 to 2.2.19 in /requirements (#16607)

Bumps [django](https://github.com/django/django) from 2.2.18 to 2.2.19.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.18...2.2.19)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/prod_django22.txt

@@ -1,5 +1,5 @@
 -r prod.txt
 
-Django==2.2.18 \
-    --hash=sha256:0eaca08f236bf502a9773e53623f766cc3ceee6453cc41e6de1c8b80f07d2364 \
-    --hash=sha256:c9c994f5e0a032cbd45089798b52e4080f4dea7241c58e3e0636c54146480bb4
+Django==2.2.19 \
+    --hash=sha256:e319a7164d6d30cb177b3fd74d02c52f1185c37304057bb76d74047889c605d9 \
+    --hash=sha256:30c235dec87e05667597e339f194c9fed6c855bda637266ceee891bf9093da43

requirements/prod_django32.txt

@@ -1,8 +1,8 @@
 -r prod.txt
 
-Django==3.2b1 \
-    --hash=sha256:b6349c182a1985b7488365ec6bb0042446153601b2d7af02e4e768f618ba25b6 \
-    --hash=sha256:b3f1afcab9bd5a6250be9caff4cdc505f4f4313cb6c0b301e92739cb80820b3f
+Django==2.2.19 \
+    --hash=sha256:e319a7164d6d30cb177b3fd74d02c52f1185c37304057bb76d74047889c605d9 \
+    --hash=sha256:30c235dec87e05667597e339f194c9fed6c855bda637266ceee891bf9093da43
 asgiref==3.3.1 \
     --hash=sha256:5ee950735509d04eb673bd7f7120f8fa1c9e2df495394992c73234d526907e17 \
     --hash=sha256:7162a3cb30ab0609f1a4c95938fd73e8604f63bdba516a7f7d64b83ff09478f0