Bump redis from 3.5.3 to 4.4.4 in /web

Bumps [redis](https://github.com/redis/redis-py) from 3.5.3 to 4.4.4.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@3.5.3...v4.4.4)

---
updated-dependencies:
- dependency-name: redis
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

web/requirements.in

@@ -1,4 +1,4 @@
 flask==1.1.2
-redis==3.5.3
+redis==4.4.4
 gunicorn==20.0.4
 Markdown==3.4.1

web/requirements.txt

@@ -4,14 +4,14 @@
 #
 #    pip-compile requirements.in
 #
+async-timeout==4.0.2
+    # via redis
 click==7.1.2
     # via flask
 flask==1.1.2
     # via -r requirements.in
 gunicorn==20.0.4
     # via -r requirements.in
-importlib-metadata==5.0.0
-    # via markdown
 itsdangerous==1.1.0
     # via flask
 jinja2==2.11.3
@@ -20,12 +20,10 @@ markdown==3.4.1
     # via -r requirements.in
 markupsafe==1.1.1
     # via jinja2
-redis==3.5.3
+redis==4.4.4
     # via -r requirements.in
 werkzeug==1.0.1
     # via flask
-zipp==3.10.0
-    # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file:
 # setuptools