build(deps-dev): update ekino/phpstan-banned-code requirement from ^1.0 to ^2.1

[dependabot[bot]]

Updates the requirements on ekino/phpstan-banned-code to permit the latest version.

Release notes

Sourced from ekino/phpstan-banned-code's releases.

v2.1.0

What's Changed

• Add non-ignorable error handling feature by @​Spomky in ekino/phpstan-banned-code#66

New Contributors

• @​Spomky made their first contribution in ekino/phpstan-banned-code#66

Full Changelog: https://github.com/ekino/phpstan-banned-code/compare/v2.0.0...v2.1.0

Changelog

Sourced from ekino/phpstan-banned-code's changelog.

v2.1.0

• Added option to prevent errors to be ignored
• Added error identifiers starting with ekinoBannedCode.

v2.0.0

• Drop support for PHP ^7.3 || ^8.0, support now only ^8.1
• Force usage of native sprintf function
• Added rule to ban shell execution via backticks
• Added rule to ban print statements
• Allow Composer plugin ergebnis/composer-normalize
• Add Composer keyword for asking user to add this package to require-dev instead of require
• Normalize leading backslashes in banned function names

v1.0.0

• Improve PHPStan configuration file
• Updated to PHPStan 1.0
• Updated to PHPUnit 9.5
• Drop support for PHP 7.2

v0.5.0

• Migrate from Travis to GitHub Actions
• Fix deprecated PHP-CS rules

v0.4.0

• Drop support for PHP 7.1
• Added support of dd function
• Replaced deprecated localheinz/composer-normalize in favor of ergebnis one
• Allow PHP ^8.0
• Switch to the new security checker
• Upgrade friendsofphp/php-cs-fixer

v0.3.1

• Fix deprecated config inside extension.neon file
• Fix tests by adding nikic/php-parser as a required dev dependency

v0.3.0

... (truncated)

Commits

• e1c3e47 Merge pull request #66 from Spomky/features/error-non-exclusion
• c3d6975 Add non-ignorable error handling to banned nodes rules
• bab2937 Merge pull request #64 from brociani/fix-ci
• c908c9c fix(ci): use sprintf native function
• 65a5752 Normalize leading backslashes in banned function names (#30)
• ac7406a chore(composer): add keyword for asking user to add this package to require-d...
• 06252b2 fix(composer): allow plugin ergebnis/composer-normalize (#58)
• c3fe363 Merge pull request #57 from BitScout/add-rule-to-ban-print
• f68d448 feat(ban): Add ban on print statements
• d3bca55 Merge pull request #56 from BitScout/22-detect-shell-exec-via-backticks
• Additional commits viewable in compare view

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