[FIX] requirements: downgrade gevent version

Since the usage of gevent 1.3.7 with python 3.6 the CPU usage exploded
on runbot running builds.

Before a better solution is found, I revert to 1.1.2 as before.

closes odoo/odoo#57281

X-original-commit: b1236c73
Signed-off-by: Xavier Dollé (xdo) <xdo@odoo.com>
Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>

requirements.txt

@@ -5,8 +5,9 @@ docutils==0.14
 ebaysdk==2.1.5
 feedparser==5.2.1
 freezegun==0.3.11
-gevent==1.3.7 ; python_version < '3.7'
+gevent==1.1.2 ; sys_platform != 'win32' and python_version < '3.7'
 gevent==1.5.0 ; python_version >= '3.7'
+gevent==1.4.0 ; sys_platform == 'win32'
 greenlet==0.4.10 ; python_version < '3.7'
 greenlet==0.4.15 ; python_version >= '3.7'
 html2text==2018.1.9