fix: pin cryptography to a version working on manylinux1 for i686

cryptography>=3.4 is only usable on manylinux2010+ systems becaus of the lack of a decent rust compiler on older systems.

Furthermore, on i686 system cryptography does not provide wheels at all. Given OpenSSL version in dockross,
this restrict a bit more which version can be built from sources.

Pin version of cryptography to 3.2.x on linux i686/x86_64.

Author: mayeut

requirements-dev.txt

@@ -16,4 +16,7 @@ wheeltools
 # need to pin cryptography for manylinux1 builds
 # cryptography only provides manylinux2010 wheels since 3.4.0
 # because of the lack of a decent rust compiler on manylinux1
-cryptography~=3.3.2 ; sys_platform=="linux" and platform_machine in "i386, i486, i586, i686, x86_64"
+# Furthermore, the x86 has no wheels at all requiring to build
+# from source. Given OpenSSL version in the dockcross image, this
+# restrict cryptography version to 3.2.x
+cryptography~=3.2.1 ; sys_platform=="linux" and platform_machine in "i386, i486, i586, i686, x86_64"