php8 incompatibilities and warnings

I have checked the plugin with phpstan under php8.0.17, WP 5.9.2 and ubuntu 20.04

following incompatibilities were reported

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Line web/wp-content/plugins/sales-manago/src/Admin/Controller/SettingsController.php
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12 Class bhr\admin\View\SettingsRenderer referenced with incorrect case: bhr\Admin\View\SettingsRenderer.
41 Class bhr\admin\View\SettingsRenderer referenced with incorrect case: bhr\Admin\View\SettingsRenderer.
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Line web/wp-content/plugins/sales-manago/src/Admin/Entity/MessageEntity.php
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33 Unsafe usage of new static().
See: https://phpstan.org/blog/solving-phpstan-error-unsafe-usage-of-new-static
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Line web/wp-content/plugins/sales-manago/src/Admin/Entity/PlatformSettings.php
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59 Unsafe usage of new static().
See: https://phpstan.org/blog/solving-phpstan-error-unsafe-usage-of-new-static
172 Method bhr\Admin\Entity\PlatformSettings::setPluginFf() should return $this(bhr\Admin\Entity\PlatformSettings) but return statement is missing.
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Line web/wp-content/plugins/sales-manago/src/Frontend/Model/CookieManager.php
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19 Method bhr\Frontend\Model\CookieManager::setCookie() should return bool but return statement is missing.
42 Method bhr\Frontend\Model\CookieManager::deleteCookie() should return bool but return statement is missing.
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Line web/wp-content/plugins/sales-manago/vendor/salesmanago/api-sso-util/src/Entity/Configuration.php
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192 Unsafe usage of new static().
See: https://phpstan.org/blog/solving-phpstan-error-unsafe-usage-of-new-static
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Line web/wp-content/plugins/sales-manago/vendor/salesmanago/api-sso-util/src/Factories/ReportFactory.php
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22 Method SALESmanago\Factories\ReportFactory::doHealthReport() should return bool but return statement is missing.
43 Method SALESmanago\Factories\ReportFactory::doUsageReport() should return bool but return statement is missing.
65 Method SALESmanago\Factories\ReportFactory::doDebugReport() should return bool but return statement is missing.
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Line web/wp-content/plugins/sales-manago/vendor/salesmanago/api-sso-util/src/Model/Collections/AbstractCollection.php
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101 Method SALESmanago\Model\Collections\AbstractCollection::valid() should return bool but return statement is missing.
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could you please fix that issues