Update eSpeak to a51235aa commit (#14483)
Closes #14281
Closes #14241
Addresses #13875 (comment)
Summary of the issue:
Janitorial update of eSpeak.
Removes a workaround added to handle a bug with eSpeaks BreakCommand implementation, tracked in espeak-ng/espeak-ng#1232, #13875 (comment)
Description of user facing changes
eSpeak is updated.
Fixes pronunciation of large numbers (#14241).
Description of development approach
Dropped strength for eSpeak BreakCommand attribute per espeak-ng/espeak-ng#1232 being fixed in eSpeak.
