fix(speech): bump phonemis to v0.3.1 (#1553)

## Description

Bumps phonemis to v0.3.1: long numbers (e.g. phone numbers) are read
digit by digit instead of being dropped, and Kokoro word timestamps
survive the new abbreviation/symbol expansion.

### Introduces a breaking change?

- [ ] Yes
- [x] No

### Type of change

- [x] Bug fix (change which fixes an issue)
- [ ] New feature (change which adds functionality)
- [ ] Documentation update (improves or adds clarity to existing
documentation)
- [ ] Other (chores, tests, code style improvements etc.)

### Tested on

- [ ] iOS
- [x] Android

### Testing instructions

- Synthesize `Please call 5551234567 to confirm your code.` with Kokoro:
the number is spoken and `words` is non-empty.

### Screenshots

### Related issues

Closes #1524

### Checklist

- [x] I have performed a self-review of my code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have updated the documentation accordingly
- [x] My changes generate no new warnings

### Additional notes

Author: msluszniak