Bump pestphp/pest from 1.1.0 to 1.9.1

Sourced from pestphp/pest's changelog.

<h2>v1.9.1 (2021-07-11)</h2> <h3>Fixed</h3>

• Callable expect values in higher order tests failing if the value was an existing method name (#334)

<h2>v1.9.0 (2021-07-09)</h2> <h3>Changed</h3>

• You may now pass just an exception message when using the throws method (#339)

<h2>v1.8.0 (2021-07-08)</h2> <h3>Added</h3>

• A new tap and test case aware expect methods for higher order tests (#331)
• Access to test case methods and properties when using skip (#338)

<h2>v1.7.1 (2021-06-24)</h2> <h3>Fixed</h3>

• The and method not being usable in Higher Order expectations (#330)

<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)

... (truncated)

• eb6de43 docs: update changelog
• 32f72cd Merge pull request #344 from pestphp/callable-expect-fix
• c160d97 Forces higher order test callable expects to be closures.
• 5ab3c6e Merge pull request #340 from pestphp/better-tap-type-hinting
• 50ece57 Improves type-hinting for target in HigherOrderTapProxy
• 9c202fa Improves type-hinting for tap method
• e4e9cb0 docs: update changelog
• 6a7597c Merge pull request #339 from pestphp/exception-improvements
• dd05452 Renames a property to be more inclusive.
• 99ea9f4 Allows you to just specify an exception message when calling throws.
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