Upgrade python/rsa to version-4.6

Exempt-From-Owner-Approval: upgrade lib
Change-Id: I0060c7ba0043698a3d7c12f36765641cfd0f8408
diff --git a/METADATA b/METADATA
index 98a8942..5c228ef 100644
--- a/METADATA
+++ b/METADATA
@@ -9,11 +9,11 @@
     type: GIT
     value: "https://github.com/sybrenstuvel/python-rsa/"
   }
-  version: "version-4.0"
+  version: "version-4.6"
   license_type: NOTICE
   last_upgrade_date {
-    year: 2019
-    month: 2
-    day: 1
+    year: 2020
+    month: 7
+    day: 10
   }
 }