www/bacula-web: upgrade to 8.6.3

Changelog
General

Fixed Composer dependency problem with smarty/smarty (see #131)
Bumped smarty/smarty to version 4.2.1
Improved support for PHP >= 8.0
Fixed PSR12 code style warnings
Improved testing and code coverage (see #133)
The error page was too verbose, even while not in debug mode (see #134)
Test page

Test page was not checking correctly the permissions on the protected
assets folder (see #136)
Console

The console check command now displays current PHP version (see #137)
Documentation

Documentation has been fixed/updated (see #138)
Added instructions for Lighttpd web server (see #129)
Fixed bug(s)

disabled
test page

New feature(s)