www/unit: update from 1.25.0 to 1.26.0.

Event: FreeBSD Vendor Summit 2021

<ChangeLog>

*) Change: the "share" option now specifies the entire path to the files

it serves, rather than a document root directory to be prepended to
the request URI.

*) Feature: automatic adjustment of existing configurations to the new

"share" behavior when updating from previous versions.

*) Feature: variables support in the "share" option.

*) Feature: multiple paths in the "share" option.

*) Feature: variables support in the "chroot" option.

*) Feature: PHP opcache is shared between application processes.

*) Feature: request routing by the query string.

*) Bugfix: the router and app processes could crash when the requests

limit was reached by asynchronous or multithreaded apps.

*) Bugfix: established WebSocket connections could stop reading frames

from the client after the corresponding listener had been
reconfigured.

*) Bugfix: fixed building with glibc 2.34, notably Fedora 35.

</ChangeLog>