piper-tts: Add version 1.8.0

Signed-off-by: riseproject-dev[bot] <330740410+riseproject-dev[bot]@users.noreply.github.com>

Author: riseproject-dev[bot]

docs/packages/piper-tts.yaml

@@ -12,3 +12,4 @@ versions:
   gpl-sources:
     filename: gpl-sources.tar
     description: piper1-gpl and eSpeak NG (both compiled from source)
+- version: 1.8.0