[FIX] requirements: fix gevent and greenlet compatibility issue

When Odoo is started in worker mode with Python 3.8.5, and
gevent/greenlet installed from requirements, the following error message
is thrown:

`RuntimeWarning: greenlet.greenlet size changed, may indicate binary
incompatibility`

As a gevent developper stated [1] that gevent 1.5 is not compatible with
Python 3.8, this commit bumps the version to 20.9.0 (current version for
the next Debian and Ubuntu releases [2] [3])

This commit should not impact those who use the Debian/Ubuntu packages
of gevent and greenlet. The error does not appear with those versions.

In Ubuntu Focal, the packaged version is 1.4.0 [4] but the problem was
not reported with this version and python 3.8.

For reference, it was bumped to 1.5.0 for Python 3.7 in [5].
And greenlet was bumped too for issues with Python 3.8 and 3.9 in [6].

As a result, the requirements for greenlet/gevents gains even more
complexity and should be cleaned when python 3.6 support will be
dropped.

[1] https://github.com/gevent/gevent/issues/1260
[2] https://packages.debian.org/bullseye/python3-gevent
[3] https://packages.ubuntu.com/hirsute/python3-gevent
[4] https://packages.ubuntu.com/focal/python3-gevent
[5] odoo/odoo@bb0b32bd1a3fc0c047d0787b10e8c1c8d696daa5
[6] odoo/odoo/@648635deca67df09417ae55c6eb181c98524b74d

Fixes #64106

closes odoo/odoo#65012

Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>

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