Several PHP Deprecated warnings

[sviluppomania]

Bug Description

Hello,
I have encountered some warnings of PHP Deprecated, below:

• Deprecated: Constant FILTER_SANITIZE_STRING is deprecated in /plugins/google-site-kit/includes/Core/Admin/Standalone.php on line 95
• Deprecated: filter_input(): Passing null to parameter #4 ($options) of type array|int is deprecated in /plugins/google-site-kit/includes/Core/Util/Input.php on line 64
• Deprecated: Constant FILTER_SANITIZE_STRING is deprecated in /plugins/google-site-kit/includes/Core/Authentication/Authentication.php on line 308
• Deprecated: stripos(): Passing null to parameter #1 ($haystack) of type string is deprecated in /plugins/google-site-kit/includes/Core/REST_API/REST_Routes.php on line 104
• Deprecated: Constant FILTER_SANITIZE_STRING is deprecated in /plugins/google-site-kit/includes/Core/Assets/Assets.php on line 909

Is there a quick solution to these alerts? :-)

Thank you

Best regards

Additional Context

• PHP Version: 8.1.12
• Plugin Version: 1.88.0

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Changelog entry

[kuasha420]

@sviluppomania Thanks for opening the issue. We are already working on this and hopefully will have these fixed in upcoming releases. See #5110 (related PR #5968) and #5998.

[sviluppomania]

@kuasha420 When will these errors be fixed?