Composer: update PHP_CodeSniffer

[jrf]

The latest PHP_CodeSniffer release is ​3.6.0 from April this year.

Based on the composer.lock file, however, WP is still using PHPCS 3.5.5 (April 2020).

I'd like to recommend an update as the releases since PHPCS 3.5.5 contain various bugfixes which may benefit WP, as well as (nearly complete) support for everything PHP 8.0, though, for now, I'd still recommend running PHPCS on PHP 7.4 in CI.

Relevant changelogs:

• ​https://github.com/squizlabs/PHP_CodeSniffer/releases/tag/3.5.6
• ​https://github.com/squizlabs/PHP_CodeSniffer/releases/tag/3.5.7
• ​https://github.com/squizlabs/PHP_CodeSniffer/releases/tag/3.6.0

To update, a patch is needed which:

1. Updates the composer.json and composer.lock files.
2. Verifies whether any exclusions made in the custom ruleset which were related to PHPCS bugs can be removed (and if applicable, removes them).
3. Verifies whether any inline phpcs:ignore annotations which were related to PHPCS bugs can be removed (and if applicable, removes them).
4. If necessary, selectively fixes newly flagged errors, which can happen when a "false negative" bug in PHPCS has been fixed.

[jrf]

Update PHPCS to version 3.6.0, no new violations flagged.

[jrf]

All four tasks have been executed and only the composer.lock file needs an update.
See GH PR ​https://github.com/WordPress/wordpress-develop/pull/1510 for a passing build.

I did come across a few stray ignore annotations during the review, but those were not related to the PHPCS update, so the patches for those have been added to the WP 5.9 CS ticket #53359.

Update the PHP_CodeSniffer dependency from version 3.5.5 to version 3.6.0.

Trac ticket: https://core.trac.wordpress.org/ticket/53477

I have also verified the ignore annotations, but no changes are needed there which are directly related to the PHPCS update. Changes which could be made have been added to #53359.

[SergeyBiryukov]

In 51470:

Build/Test Tools: Update PHP_CodeSniffer to version 3.6.0.

The latest releases contain various bugfixes, as well as (nearly complete) support for PHP 8.0.

Relevant changelogs:

• ​https://github.com/squizlabs/PHP_CodeSniffer/releases/tag/3.5.6
• ​https://github.com/squizlabs/PHP_CodeSniffer/releases/tag/3.5.7
• ​https://github.com/squizlabs/PHP_CodeSniffer/releases/tag/3.6.0

For a full list of changes in this update, see the PHP_CodeSniffer GitHub:
​https://github.com/squizlabs/PHP_CodeSniffer/compare/3.5.5...3.6.0

Props jrf.
Fixes #53477.

Closing as merged via changeset https://core.trac.wordpress.org/changeset/51470