Replace deprecated // WPCS: syntax

[richaber]

The // WPCS: syntax for whitelisting/ignoring, was specific to WPCS and is deprecated.

Per the WordPress Coding Standards wiki

Sometimes, a block of code will be flagged by WPCS with an error which you wish to ignore. An example of this could be a variable which is sanitised or escaped elsewhere before being used or output.
PHPCS lets you whitelist given errors for a line or block of code.
Example: // phpcs:ignore WordPress.Security.EscapeOutput.
Note that WPCS had native whitelist comments like below:
// Input var okay.
or
// WPCS: Input var okay.
These have been deprecated in WPCS 2.0.0 and will be removed in WPCS 3.0.0. The PHPCS format (// phpcs:ignore) is the preferred format.

I intend to submit a PR to replace the deprecated syntax.