Update requirements.txt

Segun OCA/server-tools#2896

requirements.txt

@@ -10,8 +10,8 @@ greenlet==0.4.10 ; python_version < '3.7'
 greenlet==0.4.15 ; python_version >= '3.7'
 Jinja2==2.10.1
 libsass==0.17.0
-lxml==3.7.1 ; sys_platform != 'win32' and python_version < '3.7'
-lxml==4.3.2 ; sys_platform != 'win32' and python_version >= '3.7'
+lxml==4.6.5 ; python_version <= '3.10'  # min version = 4.5.0 (Focal - with security backports)
+lxml==4.9.2 ; python_version > '3.10'
 lxml ; sys_platform == 'win32'
 Mako==1.0.7
 MarkupSafe==1.1.0
@@ -24,7 +24,7 @@ Pillow==6.1.0 ; sys_platform == 'win32' and python_version >= '3.7'
 polib==1.1.0
 psutil==5.6.6
 psycopg2==2.7.7; sys_platform != 'win32' and python_version < '3.8'
-psycopg2-binary==2.8.3; sys_platform == 'win32' or python_version >= '3.8'
+psycopg2==2.8.3; sys_platform == 'win32' or python_version >= '3.8'
 pydot==1.4.1
 python-ldap==3.1.0; sys_platform != 'win32'
 pyparsing==2.2.0