Outdated packages during PDF export install

[Kristina Hoeppner]

When I run 'makepdfexport', I got the following messages:

1. Package container-interop/container-interop is abandoned, you should avoid using it. Use psr/container instead.

2. 'Package phpunit/phpunit-mock-objects is abandoned, you should avoid using it. No replacement was suggested.'

This should be checked.

Tagging it against 20.04RC2 but could make a change only in 20.10 if it is not possible at this stage.

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/10939

[Robert Lyon (robertl-9)]

For point 1: Package container-interop/container-interop is abandoned

https://github.com/zendframework/zend-eventmanager/issues/79#issuecomment-562228837

It is a known issue and won't go away until a major version of PSR comes out

For point 2: This is an issue with using an older version of phpunit so will make a patch for that

[Robert Lyon (robertl-9)]

Also for point 2: The pdfexport was also installing it's own version of phpunit/phpunit but we didn't need it so made it that "make phpexport" didn't install the dev tools as well

[Mahara Bot (dev-mahara)]

Patch for "main" branch: https://reviews.mahara.org/12121