[v6] Bump PHP deps to 8.1

[DerManoMann]

Just a place holder and reminder.

Affected user:
v5 -> v6 : 2.3%
v4 -> v6 : 23.2%

Interestingly, ~ 50% of users on v3 are on 8.1+

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• Bump deps to PHP 8.1
• Refactor Util class into one/more non-static classes
  • FinderFactory ::finder()
  • Encoder refEncode(), refDecode()
  • Mrege shorten() into a new/simpler logger?
• [v6?] add phpdoc parser #1678
• Split logging and error handling #1162
• remove Generator::getDefaultConfig()
• remove other deprecated elements
• deprecate Generator::scan method

[fulldecent]

I think this can safely be done in v5 since 8.0 and lower is already deprecated

[DerManoMann]

It is, but we are taking things slowly. PHP 7.4 -> PHP 8.0 is still used by ~8% of users of v4.

I would think v6 with min PHP 8.1 will be coming around the middle of 2025.