fixed type

TICKET: WP-6122

Author: sasikumar-bitgo

modules/sdk-lib-mpc/src/tss/eddsa-dkls/dkg.ts

@@ -37,7 +37,7 @@ export class DKG {
   /** Optional seed for deterministic key generation */
   protected seed: Buffer | undefined;
   /** Encryption key pair for secure communication */
-  protected keyPair: EncryptionKeyPair;
+  protected keyPair: EncryptionKeyPair | null;
   /** Public key for the DKG session */
   protected sessionPublicKey: Uint8Array;
   /** Internal DKG session instance */
@@ -62,7 +62,7 @@ export class DKG {
     this.partyIdx = partyIdx;
     this.seed = seed;
     this.dklsWasm = dklsWasm ?? null;
-    this.keyPair = null as any;
+    this.keyPair = null;
   }
 
   /**