release.yml: add xauth — xvfb-run requires it

xvfb-run wraps wine in a fake X display, but it shells out to xauth
to set up the cookie. xauth isn't part of the xvfb package on
Debian trixie. Add it explicitly.

Failure: 'xvfb-run: error: xauth command not found' (run #7, task 8).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -79,7 +79,7 @@ jobs:
           # the whole interactive installer through Wine + Xvfb (which failed
           # silently in the previous iteration).
           DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
-            wine wine64 innoextract xvfb curl ca-certificates \
+            wine wine64 innoextract xvfb xauth curl ca-certificates \
             >/dev/null
           export WINEPREFIX="$HOME/.wine"
           export WINEDLLOVERRIDES="mscoree,mshtml="