update gevent and greenlet (#583)

* Bump jinja2 from 2.11.2 to 2.11.3

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)

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

* Bump pyyaml from 5.3.1 to 5.4

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.3.1 to 5.4.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@5.3.1...5.4)

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

* Bump pygments from 2.7.1 to 2.7.4

Bumps [pygments](https://github.com/pygments/pygments) from 2.7.1 to 2.7.4.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.7.1...2.7.4)

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

* Bump bottle from 0.12.18 to 0.12.19

Bumps [bottle](https://github.com/bottlepy/bottle) from 0.12.18 to 0.12.19.
- [Release notes](https://github.com/bottlepy/bottle/releases)
- [Changelog](https://github.com/bottlepy/bottle/blob/master/docs/changelog.rst)
- [Commits](bottlepy/bottle@0.12.18...0.12.19)

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

* update gevent and greenlet

* run on 3.9

* test 20.4 and 3.9

* try python 3.9

* update workflow lable

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Abdelrahman Ghanem <abom.jdev@gmail.com>

Author: 3 people

.github/workflows/jsng-ci.yml

@@ -25,10 +25,10 @@ jobs:
             python-version: 3.8
             experimental: true
             name: Experimental build - latest Ubuntu
-          #- python-version: 3.9
-          #  os: ubuntu-18.04
-          #  experimental: true
-          #  name: Experimental build - latest Python
+          - os: ubuntu-20.04
+            python-version: 3.9
+            experimental: true
+            name: Experimental build - latest Python
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}