## Why
Cygwin records installation timestamps in an unused Java truststore, changing Bazel action cache keys when the same tools are reinstalled.
## What changed
Exclude `cygwin/etc/pki/ca-trust/extracted/java/cacerts` from the generated `cygwin` filegroup in `.github/scripts/voice_windows_tools.py`.
GitOrigin-RevId: 8fdd910fadba7d977b45718546232652d073cdc8