Bump faker from 2.0.0 to 4.0.0 in /app

Bumps [faker](https://github.com/joke2k/faker) from 2.0.0 to 4.0.0.
- [Release notes](https://github.com/joke2k/faker/releases)
- [Changelog](https://github.com/joke2k/faker/blob/master/CHANGELOG.rst)
- [Commits](joke2k/faker@v2.0.0...v4.0.0)

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

Author: dependabot-preview[bot]

app/requirements/constraints.txt

@@ -16,9 +16,9 @@ billiard==3.5.0.5 \
 kombu==4.6.7 \
     --hash=sha256:2a9e7adff14d046c9996752b2c48b6d9185d0b992106d5160e1a179907a5d4ac \
     --hash=sha256:67b32ccb6fea030f8799f8fd50dd08e03a4b99464ebc4952d71d8747b1a52ad1
-Faker==2.0.0 \
-    --hash=sha256:b3bb64aff9571510de6812df45122b633dbc6227e870edae3ed9430f94698521 \
-    --hash=sha256:96ad7902706f2409a2d0c3de5132f69b413555a419bacec99d3f16e657895b47
+Faker==4.0.0 \
+    --hash=sha256:047d4d1791bfb3756264da670d99df13d799bb36e7d88774b1585a82d05dbaec \
+    --hash=sha256:1b1a58961683b30c574520d0c739c4443e0ef6a185c04382e8cc888273dbebed
 mccabe==0.6.1 \
     --hash=sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42 \
     --hash=sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f