Lock file maintenance (#43425)

* Lock file maintenance
* Downgrade `@automattic/data-stores` again
  Same as last time, no new release since the broken 3.1.1. Add a pnpmfile
  hack for it this time.
* Fix Phan issues.
  * Various stringified-int fields in WP_Comment and WP_Post are now being
    initiailized with actual stringified ints, causing Phan to no longer
    consider them as "string|int" type, so they need to be cast when being
    passed to int-taking functions.
  * Exclude Boost's polyfill for a WP-6.8-added class from Phan when
    6.8 is being used. Also suppress the "undeclared method" for some
    calls in the tests for the polyfill.
  * String cast for `untrailingslashit()` in one place now that the phpdoc
    is correct so Phan knows it takes a string.
  * Bunch of baselines need updating now that `WP_Widget::form()` is
    `@return string|void` so PhanTypeMissingReturn is no longer triggered.
    Return types explicitly set to that so old-WP Phan run is happy too.

---------

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Brad Jorsch <brad.jorsch@automattic.com>

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/15002718041

Upstream-Ref: Automattic/jetpack@e13fd52

Author: anomiex

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.48.1-alpha] - unreleased
+
+This is an alpha version! The changes listed here are not final.
+
 ## [0.48.0] - 2025-05-12
 ### Added
 - Surface search corrections when correcting search terms. [#42473]
@@ -1214,6 +1218,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Updated package dependencies.
 - Update PHPUnit configs to include just what needs coverage rather than include everything then try to exclude stuff that doesn't.
 
+[0.48.1-alpha]: https://github.com/Automattic/jetpack-search/compare/v0.48.0...v0.48.1-alpha
 [0.48.0]: https://github.com/Automattic/jetpack-search/compare/v0.47.24...v0.48.0
 [0.47.24]: https://github.com/Automattic/jetpack-search/compare/v0.47.23...v0.47.24
 [0.47.23]: https://github.com/Automattic/jetpack-search/compare/v0.47.22...v0.47.23

src/class-package.php

@@ -11,7 +11,7 @@
  * Search package general information
  */
 class Package {
-	const VERSION = '0.48.0';
+	const VERSION = '0.48.1-alpha';
 	const SLUG    = 'search';
 
 	/**

src/widgets/class-search-widget.php

@@ -737,6 +737,7 @@ protected function maybe_reformat_widget( $widget_instance ) {
 	 * Outputs the settings update form.
 	 *
 	 * @param array $instance Previously saved values from database.
+	 * @return string|void
 	 * @since 5.0.0
 	 */
 	public function form( $instance ) {