fix: authenticate curl requests to googlesource in lint workflow
The "Download GN Binary" and "Download clang-format Binary" steps
fetch files from chromium.googlesource.com without passing
authentication cookies. When googlesource rate-limits or returns a
transient error (502), the HTML error page is piped into `base64 -d`,
causing `base64: invalid input`.
The `set-chromium-cookie` action already configures `~/.gitcookies`
in a prior step. Pass `-b ~/.gitcookies` to both `curl` calls so
they authenticate, matching what the cookie verification step itself
does.
Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>