Polly doesn't accept multi byte text

[tkashi]

Describe the bug When I set a multi-byte string like '２。' as a text in Polly, it produces InvalidSignatureException "The request signature we calculated does not match the signature you provided. "

SDK version number 1.0.0-beta.3

Is the issue in the browser/Node.js? Browser

Details of the browser/Node.js version Paste output of npx envinfo --browsers or node -v

Browsers: Chrome: 81.0.4044.113 Firefox: 68.6.1 Safari: 13.1

To Reproduce (observed behavior)

1. Run the following code with a valid credential in any browser:

   import { PollyClient, SynthesizeSpeechCommand } from "@aws-sdk/client-polly";
   
   const client = new PollyClient({ region: "us-east-1", credentials: credential });
   const synthesizeSpeechCommand = new SynthesizeSpeechCommand({
       OutputFormat: 'mp3',
       Text: '２。',
       VoiceId: 'Mizuki',
       TextType: 'text',
       SampleRate: '24000'
   });
   client.send(synthesizeSpeechCommand);

The final line client.send produces the error.

Expected behavior This request should get a response with a suitable audio stream.

Screenshots

(sdk v2 is just for getting credentials...)

Additional context The similar fix is required as in #183 for Node.js.

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