Upgrade from 1.15.3 to 1.15.4.

<ChangeLog>

*) Feature: now the "ssl_early_data" directive can be used with OpenSSL.

*) Bugfix: in the ngx_http_uwsgi_module.
   Thanks to Chris Caputo.

*) Bugfix: connections with some gRPC backends might not be cached when
   using the "keepalive" directive.

*) Bugfix: a socket leak might occur when using the "error_page"
   directive to redirect early request processing errors, notably errors
   with code 400.

*) Bugfix: the "return" directive did not change the response code when
   returning errors if the request was redirected by the "error_page"
   directive.

*) Bugfix: standard error pages and responses of the
   ngx_http_autoindex_module module used the "bgcolor" attribute, and
   might be displayed incorrectly when using custom color settings in
   browsers.
   Thanks to Nova DasSarma.

*) Change: the logging level of the "no suitable key share" and "no
   suitable signature algorithm" SSL errors has been lowered from "crit"
   to "info".

</ChangeLog>

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