chore(deps-dev): bump pestphp/pest from 1.15.0 to 1.21.1

Sourced from pestphp/pest's releases.

<h2>v1.21.1</h2> <h2>Fixed</h2>

• Fixed a bug with sequence in expectations pestphp/pest#442

<h2>v1.20.0</h2> <h3>Added</h3>

• throwsIf test call (#371)
• --ci CLI option to ignore development options like ->local() (#405)
• when conditional expectation (#406)
• unless conditional expectation (b43a598)
• match conditional expectation (#407)

<h3>Fixed</h3>

• sequence with more expectations than iterable elements (#399)

Sourced from pestphp/pest's changelog.

<h2>v1.21.1 (2021-11-25)</h2> <h3>Fixed</h3>

• sequence callables causing problems (#442)

<h2>v1.21.0 (2021-11-17)</h2> <h3>Added</h3>

• warn about xdebug modes (1e011c)

<h2>v1.20.0 (2021-09-25)</h2> <h3>Added</h3>

• throwsIf test call (#371)
• --ci CLI option to ignore development options like ->local() (#405)
• when conditional expectation (#406)
• unless conditional expectation (b43a598)
• match conditional expectation (#407)

<h3>Fixed</h3>

• sequence with more expectations than iterable elements (#399)

<h2>v1.19.0 (2021-09-20)</h2> <h3>Added</h3>

• PHP 8.1 support (e6c7d68)
• toHaveProperties expectation (#391)

<h2>v1.18.0 (2021-08-30)</h2> <h3>Added</h3>

• toHaveLength expectation (#386)
• nunomaduro/collision:^6.0 support (4ae482c)

<h2>v1.17.0 (2021-08-26)</h2> <h3>Added</h3>

• toThrow expectation (#361)

<h2>v1.16.0 (2021-08-19)</h2> <h3>Added</h3>

• Support for new parallel options (#369)

• 92b8d32 release: v1.21.1
• 2969c7a Merge pull request #442 from pestphp/fix_for_sequence
• 63c1faa Prevents issues with callables in sequence
• b5b14ef chore: updates changelog branch to 1.x
• 11eb190 release: v1.21.0
• a110848 docs: updates changelog
• da5c21d Update README.md
• 408ae4c docs: adds spatie.be as platinum sponsor
• fc2484a Update README.md
• de46ee0 fix: adds link to xdebug coverage mode
• Additional commits viewable in compare view

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