chore: remove support for php7.4

[miaulalala]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (df2d51b) 24.53% compared to head (6318d5f) 24.53%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #5607   +/-   ##
=========================================
  Coverage     24.53%   24.53%           
  Complexity      418      418           
=========================================
  Files           243      243           
  Lines         10785    10785           
  Branches       1755     1755           
=========================================
  Hits           2646     2646           
  Misses         8139     8139           

Flag	Coverage Δ
javascript	15.57% <ø> (ø)
php	61.60% <ø> (ø)

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[tcitworld]

Please also change config>platform>php in composer.json.

[tcitworld]

And change requirement on php in composer.json as well

[st3iny]

What Thomas said also applies to https://github.com/nextcloud/calendar/blob/main/vendor-bin/cs-fixer/composer.json, https://github.com/nextcloud/calendar/blob/main/vendor-bin/psalm/composer.json and https://github.com/nextcloud/calendar/blob/main/vendor-bin/phpunit/composer.json.

[miaulalala]

Changed php requirements and platform to 8.0