fix: update rpc sendTransaction format to upstream

web3.js/module.flow.js

@@ -194,6 +194,9 @@ declare module '@solana/web3.js' {
       transaction: Transaction,
       ...signers: Array<Account>
     ): Promise<TransactionSignature>;
+    sendEncodedTransaction(
+      encodedTransaction: string,
+    ): Promise<TransactionSignature>;
     sendRawTransaction(wireTransaction: Buffer): Promise<TransactionSignature>;
     onAccountChange(
       publickey: PublicKey,

web3.js/src/connection.js

@@ -1219,9 +1219,21 @@ export class Connection {
    */
   async sendRawTransaction(
     rawTransaction: Buffer,
+  ): Promise<TransactionSignature> {
+    const encodedTransaction = bs58.encode(rawTransaction);
+    const result = await this.sendEncodedTransaction(encodedTransaction);
+    return result;
+  }
+
+  /**
+   * Send a transaction that has already been signed, serialized into the
+   * wire format, and encoded as a base58 string
+   */
+  async sendEncodedTransaction(
+    encodedTransaction: string,
   ): Promise<TransactionSignature> {
     const unsafeRes = await this._rpcRequest('sendTransaction', [
-      [...rawTransaction],
+      encodedTransaction,
     ]);
     const res = SendTransactionRpcResult(unsafeRes);
     if (res.error) {