Adjust code style to meet current php-cs-fixer

[phil-davis]

php-cs-fixer is reporting these. I guess there has been a newer php-cs-fixer version released that is different.

It wants "root" classes and functions to use the leading \ - \InvalidArgumentException \substr

[codecov]

Codecov Report

Merging #604 (a19734a) into master (5f6665f) will not change coverage.
The diff coverage is n/a.

❗ Current head a19734a differs from pull request most recent head bd04f6a. Consider uploading reports for the commit bd04f6a to get more accurate results

@@            Coverage Diff            @@
##             master     #604   +/-   ##
=========================================
  Coverage     98.76%   98.76%           
  Complexity     1865     1865           
=========================================
  Files            71       71           
  Lines          5325     5325           
=========================================
  Hits           5259     5259           
  Misses           66       66           

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[phil-davis]

The php unit test fails for PHP 8.1 and 8.2 are because of php/php-src#10218
Timezones GMT+n were broken in PHP 8.1.14 and 8.2.1 released in early January.

Fixed in commit php/php-src@d12ba11
But that will likely not be released until Feb 2023.

[phil-davis]

https://github.com/sabre-io/vobject/actions/runs/3964660146/jobs/6793716785

It still uses PHP 8.1.14 in the workflow.

I raised issue shivammathur/setup-php#687 to see if there is some way to successfully select an old PHP patch release.

[phil-davis]

See #605 for the code that fixes CI.

I will leave this PR here for now, as it demonstrates shivammathur/setup-php#687

[phil-davis]

Issue shivammathur/setup-php#687
Specifying an old patch release of PHP is not supported.
To work around the problem/regression in PHP 8.1.14 and 8.2.1 I did:
3bef1cf

So this PR is no longer needed, closing.