fix(deps): update dependency phpunit/phpunit to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpunit/phpunit (source)	^8|^9 -> 8.5.38

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v8.5.38: PHPUnit 8.5.38

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Changed

• The namespaces of dependencies are now prefixed with PHPUnitPHAR instead of just PHPUnit for the PHAR distribution of PHPUnit

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How to install or update PHPUnit

v8.5.37

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v8.5.36

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v8.5.35

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v8.5.34

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v8.5.33

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v8.5.32

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v8.5.31

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v8.5.30

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v8.5.28

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v8.5.27

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v8.5.26

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v8.5.25

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v8.5.24

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v8.5.23

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v8.5.22

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v8.5.21

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v8.5.20

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v8.5.19

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v8.5.18

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v8.5.17

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v8.5.16

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v8.5.14

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v8.5.13

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v8.5.12

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v8.5.11

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v8.5.10

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v8.5.9

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[mrdavidburns]

@justafish What do we do here when a compatible version breaks our builds?
I know we don't want to merge this because we don't want to pin to this specific version, but do we need to adjust things so that our builds all pass with the version that is being pinned here?

[mrdavidburns]

Here's the conflict

  Problem 1
    - phpunit/phpunit 8.5.37 requires sebastian/diff ^3.0.2 -> found sebastian/diff[3.0.2, ..., 3.0.x-dev] but these were not loaded, likely because it conflicts with another require.
    - lullabot/drainpipe-dev dev-main requires phpunit/phpunit 8.5.37 -> satisfiable by phpunit/phpunit[8.5.37].
    - Root composer.json requires lullabot/drainpipe-dev @dev -> satisfiable by lullabot/drainpipe-dev[dev-main].

[mrdavidburns]

Next step from meeting: When an issue like this, where the update is still within range of allowed versions then checkout the branch and try to fix the conflict so we know how to address the issue. Then we can discuss what we would need to merge in so others don't experience this error.

[justafish]

@mrdavidburns It looks like phpunit 8 was dropped 9.x -> 10.x, so we can change this to ^9

[renovate]

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