CI: Update to gcc-13.1.0

As this is the current version of the public cross toolchains we use,
upgrade to this now.

Suggested-by: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Alexey Brodkin <abrodkin@synopsys.com>
Reviewed-by: Simon Glass <sjg@chromium.org>