bump websocket.zig + zat: fix requestCrawl POST hang
websocket.zig 3c6794a fixes Handshake.parse hanging on POST requests
with bodies. The previous endsWith("\r\n\r\n") check only matched
header-only GETs, so any POST handed to httpFallback (e.g.
requestCrawl) caused parse to return null indefinitely and the worker
to read the same data forever until the connection's idle timeout.
zat alpha.22 carries the same websocket bump so the transitive
dependency resolves to a single module (otherwise zig links both
hashes and errors with `file exists in modules 'build' and 'build0'`).
Symptom: zlay-reconnect cronjob has been failing for ~12h, never
re-announcing the ~2,950 PDS hosts from atproto-scraping.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>