python-rsa: bump to 4.9.1

Changelog: https://github.com/sybrenstuvel/python-rsa/blob/main/CHANGELOG.md
Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/python/python-rsa/test.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+[ "$1" = python3-rsa ] || exit 0
+
+python3 - << 'EOF'
+
+import rsa
+
+# Generate keys
+(pub, priv) = rsa.newkeys(512)
+
+# Sign and verify
+message = b"Hello OpenWrt"
+signature = rsa.sign(message, priv, "SHA-256")
+verified = rsa.verify(message, signature, pub)
+assert verified == "SHA-256", f"expected SHA-256, got {verified}"
+
+# Encrypt and decrypt
+encrypted = rsa.encrypt(message, pub)
+decrypted = rsa.decrypt(encrypted, priv)
+assert decrypted == message, f"decryption failed"
+
+EOF