Bump dependencies

Bumps [lxml](https://github.com/lxml/lxml) from 4.5.0 to 4.6.3.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.5.0...lxml-4.6.3)
- PR #42

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.2 to 2.11.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/master/CHANGES.rst)
- [Commits](pallets/jinja@2.11.2...2.11.3)
- PR #41

Bumps [pillow](https://github.com/python-pillow/Pillow) from 7.1.2 to 8.1.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@7.1.2...8.1.1)
- PR #40

Bumps [cryptography](https://github.com/pyca/cryptography) from 2.9.2 to 3.3.2.
- [Release notes](https://github.com/pyca/cryptography/releases)
- [Changelog](https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst)
- [Commits](pyca/cryptography@2.9.2...3.3.2)
- PR #37

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

Author: dependabot[bot]

requirements.txt

@@ -7,7 +7,7 @@ certifi==2020.4.5.1
 cffi==1.14.0
 chardet==3.0.4
 click==7.1.2
-cryptography==2.9.2
+cryptography==3.3.2
 dnspython==1.16.0
 Flask==1.1.2
 Flask-Migrate==2.1.1
@@ -18,14 +18,14 @@ gunicorn==19.7.1
 idna==2.9
 isort==4.3.21
 itsdangerous==1.1.0
-Jinja2==2.11.2
+Jinja2==2.11.3
 lazy-object-proxy==1.4.3
-lxml==4.5.0
+lxml==4.6.3
 Mako==1.1.2
 MarkupSafe==1.1.1
 mccabe==0.6.1
 oic==0.11.0.1
-Pillow==7.1.2
+Pillow==8.1.1
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycparser==2.20