SNOW-1935873 Fix test different key length (#2176)

Author: sfc-gh-mkubik

DESCRIPTION.md

@@ -12,8 +12,9 @@ Source code is also available at: https://github.com/snowflakedb/snowflake-conne
   - Removed the workaround for a Python 2.7 bug.
   - Added a <19.0.0 pin to pyarrow as a workaround to a bug affecting Azure Batch.
   - Optimized distribution package lookup to speed up import.
-  - Fixed a bug where privatelink OCSP Cache url could not be determined if privatelink account name was specified in uppercase
-  - Added support for iceberg tables to `write_pandas`
+  - Fixed a bug where privatelink OCSP Cache url could not be determined if privatelink account name was specified in uppercase.
+  - Added support for iceberg tables to `write_pandas`.
+  - Fixed base64 encoded private key tests.
 
 - v3.13.2(January 29, 2025)
   - Changed not to use scoped temporary objects.

test/integ/test_key_pair_authentication.py

@@ -128,7 +128,7 @@ def fin():
                 pass
 
             # Ensure the base64-encoded version also works
-            db_config["private_key"] = base64.b64encode(private_key_der)
+            db_config["private_key"] = base64.b64encode(private_key_der).decode()
             with snowflake.connector.connect(**db_config) as _:
                 pass