[Bug]: sp-button doesn't support `aria-label`

### Code of conduct

- [x] I agree to follow this project's code of conduct.

### Impacted component(s)

sp-button

### Library version

1.1.1

### Expected behavior

sp-button should be able to customize aria-label attribute

### Actual behavior

for a `icon-only` `sp-button` voice over can only read `button` and cannot customize aria-label

### Screenshots

_No response_

### What browsers are you seeing the problem in?

_No response_

### How can we reproduce this issue?

1. Go to https://opensource.adobe.com/spectrum-web-components/storybook/index.html?path=/story/button-black-fill--with-icon-only
2. With VoiceOver on mac on, click on the icon-only sp-button
3. Voice over reads `button` and no aria-label was exposed to clients for customization

### Sample code or abstract reproduction which illustrates the problem

```

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### Severity

SEV 3

### Logs taken while reproducing problem

_No response_

### Would you like to track this issue in Jira?

- [x] Yes, please tell me the ticket number!

Start at the sp-button component implementation and reproduce the icon-only example from the linked Storybook story with VoiceOver. Verify that an aria-label supplied on sp-button is exposed to assistive technology, and confirm the behavior using the sample markup and VoiceOver reproduction steps.

Written by the indexing model from the issue text.