[Snyk] Security upgrade requests from 2.20.0 to 2.31.0 (#1201)

fix: deploy-board/requirements.txt to reduce vulnerabilities


The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-REQUESTS-5595532

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

deploy-board/requirements.txt

@@ -1,7 +1,7 @@
 Django==1.11.29
 python-dateutil==2.8.2
 pytz==2014.10
-requests==2.20.0
+requests==2.31.0
 diff-match-patch==20110725.1
 oauthlib==1.0.3
 flake8==2.4.1