Bump gunicorn from 19.3.0 to 19.5.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 19.3.0 to 19.5.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@19.3...19.5.0)

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

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
 Flask==2.1.1
 boto3==1.13.26
-gunicorn==19.3.0
+gunicorn==19.5.0
 requests