[5.8] Fix strict comparison in redis configuration Parsing

[mathieutu]

Proper fix for issue #28829.

Problem:

• Input of the function:
  [0 => 'url1', 1 => 'url2', 2 => 'url3']

• Expected output:
  [0 => 'url1', 1 => 'url2', 2 => 'url3']

• Actual output:
  [1 => 'url2', 2 => 'url3']

This is about strict comparison in in_array method:

>>> in_array(0, ['foo'])
=> true
>>> in_array(0, ['foo'], true)
=> false

Thanks.
Matt'

PS: Again, this would not happen with tests.

I have no time to add proper tests on all of this RedisManager, but I think this is something we should have. Can be a good first PR for someone who want to contribute.

[driesvints]

@mathieutu I still feel we should add tests for this, otherwise we risk that this breaks again in a future update. Maybe we should leave this open for a bit until someone can PR in a test to your PR?

[mathieutu]

@driesvints Actually this particular PR fixes a bug people have, so we have to merge it as soon as possible, and this is on a very specific part that will not cause any breaking change (just adding strictness on internal check).

[tomswinkels]

@driesvints We can't update Laravel on this moment anymore, this bug are highprio for us. With this fix we are can update Laravel to te newest version.

[TBlindaruk]

@mathieutu created an issue for the tests #28852