python: Upgrade pywin32

Remove pinned pywin32 version. Require an upgrade of pywin32 to a
version that includes security and bug fixes we'd like (CVE-2021-32559).

Author: Patater

requirements.txt

@@ -21,7 +21,7 @@ pycryptodome>=3.9.3,<4
 pyusb>=1.0.0,<2.0.0
 hidapi>=0.7.99,<0.8.0;platform_system!="Linux"
 cmsis-pack-manager>=0.2.3,<0.3.0
-pywin32==224;platform_system=='Windows'
+pywin32>=301;platform_system=='Windows'
 wmi==1.4.9;platform_system=='Windows'
 psutil==5.6.6
 cryptography>=3.2,<4