fix: deploy/pyenv/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-174126
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-458931

Author: snyk-bot

deploy/pyenv/requirements.txt

@@ -9,7 +9,7 @@ gunicorn==19.9.0
 huey==1.10.2
 idna==2.7
 itsdangerous==0.24
-Jinja2==2.10
+Jinja2==2.11.3
 MarkupSafe==1.0
 psutil==5.4.7
 PyGithub==1.43.2
@@ -22,5 +22,5 @@ requests-file==1.4.3
 six==1.11.0
 tldextract==2.2.0
 urllib3==1.23
-Werkzeug==0.14.1
+Werkzeug==0.15.3
 wrapt==1.10.11