[docs] Add link to OtterSec zk-token-sdk audit (#6052)

add ottersec zk-token-sdk audit

Author: samkim-crypto

docs/src/token-2022.md

@@ -158,3 +158,6 @@ Here are the completed audits as of 13 December 2023:
 * OtterSec
     - Review commit hash [`e92413`](https://github.com/solana-labs/solana-program-library/tree/e924132d65ba0896249fb4983f6f97caff15721a)
     - Final report https://github.com/solana-labs/security-audits/blob/master/spl/OtterSecToken2022Audit-2023-11-03.pdf
+* OtterSec (ZK Token SDK)
+    - Review commit hash [`9e703f8`](https://github.com/solana-labs/solana/tree/9e703f8/zk-token-sdk)
+    - Final report https://github.com/solana-labs/security-audits/blob/master/spl/OtterSecZkTokenSdkAudit-2023-11-04.pdf