chore(deps-dev): bump pestphp/pest from 1.1.0 to 1.8.0

Sourced from pestphp/pest's changelog.

<h2>v1.8.0 (2021-06-23)</h2> <h3>Added</h3>

• Support for PHPUnit 9.5.6 (#329)

<h2>v1.7.0 (2021-06-19)</h2> <h3>Added</h3>

• Support for non-callable values in the sequence method, which will be passed as toEqual (#323)
• Support for nested Higher Order Expectations (#324)

<h2>v1.6.0 (2021-06-18)</h2> <h3>Added</h3>

• Adds a new json expectation method to improve testing with JSON strings (#325)
• Adds dot notation support to the toHaveKey and toHaveKeys expectations (#322)

<h2>v1.5.0 (2021-06-15)</h2> <h3>Changed</h3>

• Moves plugins from the require section to the core itself (#317), (#318), (#320)

<h2>v1.4.0 (2021-06-10)</h2> <h3>Added</h3>

• Support for multiple datasets (Matrix) on the with method (#303)
• Support for incompleted tests (49de462)

<h2>v1.3.2 (2021-06-07)</h2> <h3>Fixed</h3>

• Test cases with the @ symbol in the directory fail (#308)

<h2>v1.3.1 (2021-06-06)</h2> <h3>Added</h3>

• Added for PHPUnit 9.5.5 (#310)

<h3>Changed</h3>

• Lock minimum Pest plugin versions (#306)

<h2>v1.3.0 (2021-05-23)</h2> <h3>Added</h3>

• Named datasets no longer show the arguments (#302)

<h3>Fixed</h3>

• Wraps global functions within function_exists (#300)

<h2>v1.2.1 (2021-05-14)</h2> <h3>Fixed</h3>

• Laravel commands failing with new --test-directory option (#297)

<h2>v1.2.0 (2021-05-13)</h2> <h3>Added</h3>

• Adds JUnit / Infection support (#291)
• --test-directory command line option (#283)

• e68c7b0 docs: update changelog
• 621718d Merge pull request #329 from bigint/master
• 59adc57 Update phpunit/phpunit to 9.5.6
• 1680613 docs: update changelog
• f6d3ce4 chore: updates funding
• d16a48b chore: cs
• 9459ce4 Merge pull request #324 from pestphp/nested-higher-order-expectations
• c773d1c chore: type checks scripts folder
• 22a1aac Fixes types
• 3a20696 CS
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