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

Author: sfc-gh-mkubik

DESCRIPTION.md

@@ -8,23 +8,6 @@ Source code is also available at: https://github.com/snowflakedb/snowflake-conne
 
 # Release Notes
 
-<<<<<<< HEAD
-=======
-- v3.12.5(TBD)
-  - Added a feature to limit the sizes of IO-bound ThreadPoolExecutors during PUT and GET commands.
-  - Adding support for the new PAT authentication method.
-  - Updated README.md to include instructions on how to verify package signatures using `cosign`.
-  - Updated the log level for cursor's chunk rowcount from INFO to DEBUG.
-  - Added a feature to verify if the connection is still good enough to send queries over.
-  - Added support for base64-encoded DER private key strings in the `private_key` authentication type.
-
-- v3.12.4(December 3,2024)
-  - Fixed a bug where multipart uploads to Azure would be missing their MD5 hashes.
-  - Fixed a bug where OpenTelemetry header injection would sometimes cause Exceptions to be thrown.
-  - Fixed a bug where OCSP checks would throw TypeError and make mainly GCP blob storage unreachable.
-  - Bumped pyOpenSSL dependency from >=16.2.0,<25.0.0 to >=22.0.0,<25.0.0.
-
->>>>>>> 4b3ded11 (Support base64-encoded DER private keys (#2134))
 - v3.12.3(October 25,2024)
   - Improved the error message for SSL-related issues to provide clearer guidance when an SSL error occurs.
   - Improved error message for SQL execution cancellations caused by timeout.

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