Log Message:
devel/php-xdebug: update to 2.9.6

Update php-xdebug to 2.9.6.

Fri, May 29, 2020 - xdebug 2.9.6

Fixed bugs:

- Fixed issue #1782: Cookie "XDEBUG_SESSION" will be soon rejected because
  it has the "sameSite" attribute set to none
- Fixed issue #1787: Branch coverage data does not always follow the
  lines/functions format
- Fixed issue #1790: Segfault in var_dump() or while debugging with protobuf
  extension