Update eSpeak-NG to 1.54-dev commit 961454ff (#16976)
Closes #16775
Summary of the issue:
eSpeak needs to be updated for 2024.4.
Description of user facing changes
Added languages Faroese and Xextan to eSpeak-NG.
Description of development approach
Followed the update instructions.
Testing strategy:
Rebuilt NVDA from source. Ran NVDA, switched synth to eSpeak-NG. Tested that speech output worked fine in English. Switched voice to Faroese and Xextan and ensured that there was still output.
Known issues with pull request:
None.
