Bump to PHP 8.2 and leverage its new features

[tvdijen]

• Replaces constants with new openssl-builtin openssl_cipher_key_length
• Replaces generic Exception with the more specific new Random\RandomException

Note: readonly properties cannot be used because of XML serialization

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.11%. Comparing base (f99737b) to head (b58d5ee).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #66   +/-   ##
=========================================
  Coverage     93.11%   93.11%           
  Complexity      757      757           
=========================================
  Files           128      128           
  Lines          3106     3106           
=========================================
  Hits           2892     2892           
  Misses          214      214           

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