Simplify JSON validation

[arogachev]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

[what-the-diff[bot]]

PR Summary

• Introduced support for 8.3 version in build processes This change involved adding version 8.3 to our PHP build workflows. This means our code will now run and be tested across the new 8.3 version of PHP, ensuring better compatibility with the latest releases.

• Improved validation for JSON handlers The modification in the JSONHandler.php file was about the handling of JSON validation. Previously, we validated JSON data using json_decode. Now, we introduced a check for a newer, more specific function, json_validate. If this function exists on the user's server, it will be used instead for a more robust and accurate JSON content validation. If it's not available, the program falls back on json_decode. This improves the precision of our JSON handling, leading to fewer errors in processing JSON data.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (493a2d1) 94.45% compared to head (a0a0798) 94.45%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #639 +/- ## ========================================= Coverage 94.45% 94.45% - Complexity 776 777 +1 ========================================= Files 91 91 Lines 2361 2362 +1 ========================================= + Hits 2230 2231 +1 Misses 131 131 ```

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