Bump example MATLAB release in README

Co-authored-by: Mark Cafaro <34887852+mcafaro@users.noreply.github.com>

Author: jwpereira

README.md

@@ -55,7 +55,7 @@ When you define your workflow in the `.github/workflows` directory of your repos
 
 | Input     | Description |
 |-----------|-------------|
-| `release` | (Optional) MATLAB release to set up. You can specify R2020a or a later release. If you do not specify `release`, the action sets up the latest release of MATLAB.<br/>**Example**: `R2020a`
+| `release` | (Optional) MATLAB release to set up. You can specify R2020a or a later release. If you do not specify `release`, the action sets up the latest release of MATLAB.<br/>**Example**: `R2021a`
 
 ## Notes
 When you use the **Setup MATLAB** action, you execute third-party code that is licensed under separate terms.