Declare PHP version requirement in all Composer packages (#34192)

This makes for a better experience for third parties using the packages,
as they can see on Packagist which PHP versions the package is supposed
to support.

Also this is a good excuse to make a major version bump for all the
packages following #34126 which removed testing with PHP 5.6 and allows
use of 7.0+ features going forward.

And since we're making systematic use of declared PHP versions now,
let's lint for that and make use of it to skip phpunit tests where
appropriate.

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/6930571592

CHANGELOG.md

@@ -5,10 +5,13 @@ 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).
 
-## [1.17.13-alpha] - unreleased
+## [2.0.0-alpha] - unreleased
 
 This is an alpha version! The changes listed here are not final.
 
+### Changed
+- The package now requires PHP >= 7.0.
+
 ## [1.17.12] - 2023-11-14
 ### Changed
 - Updated package dependencies. [#34093]
@@ -514,7 +517,7 @@ This is an alpha version! The changes listed here are not final.
 
 - Add API endpoints and Jetpack Backup package for managing Help…
 
-[1.17.13-alpha]: https://github.com/Automattic/jetpack-backup/compare/v1.17.12...v1.17.13-alpha
+[2.0.0-alpha]: https://github.com/Automattic/jetpack-backup/compare/v1.17.12...v2.0.0-alpha
 [1.17.12]: https://github.com/Automattic/jetpack-backup/compare/v1.17.11...v1.17.12
 [1.17.11]: https://github.com/Automattic/jetpack-backup/compare/v1.17.10...v1.17.11
 [1.17.10]: https://github.com/Automattic/jetpack-backup/compare/v1.17.9...v1.17.10

composer.json

@@ -4,15 +4,16 @@
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
 	"require": {
-		"automattic/jetpack-assets": "^1.18.16-alpha",
-		"automattic/jetpack-admin-ui": "^0.2.26-alpha",
-		"automattic/jetpack-autoloader": "^2.12.0",
-		"automattic/jetpack-composer-plugin": "^1.1.14",
-		"automattic/jetpack-config": "^1.15.4",
-		"automattic/jetpack-connection": "^1.60.2-alpha",
-		"automattic/jetpack-identity-crisis": "^0.11.4-alpha",
-		"automattic/jetpack-sync": "^1.60.1",
-		"automattic/jetpack-status": "^1.19.0"
+		"php": ">=7.0",
+		"automattic/jetpack-assets": "^2.0.0-alpha",
+		"automattic/jetpack-admin-ui": "^0.3.0-alpha",
+		"automattic/jetpack-autoloader": "^3.0.0-alpha",
+		"automattic/jetpack-composer-plugin": "^2.0.0-alpha",
+		"automattic/jetpack-config": "^2.0.0-alpha",
+		"automattic/jetpack-connection": "^2.0.0-alpha",
+		"automattic/jetpack-identity-crisis": "^0.12.0-alpha",
+		"automattic/jetpack-sync": "^2.0.0-alpha",
+		"automattic/jetpack-status": "^2.0.0-alpha"
 	},
 	"require-dev": {
 		"automattic/jetpack-changelogger": "^4.0.0-alpha",
@@ -66,7 +67,7 @@
 			"link-template": "https://github.com/Automattic/jetpack-backup/compare/v${old}...v${new}"
 		},
 		"branch-alias": {
-			"dev-trunk": "1.17.x-dev"
+			"dev-trunk": "2.0.x-dev"
 		}
 	},
 	"config": {

src/class-package-version.php

@@ -12,7 +12,7 @@
  */
 class Package_Version {
 
-	const PACKAGE_VERSION = '1.17.13-alpha';
+	const PACKAGE_VERSION = '2.0.0-alpha';
 
 	const PACKAGE_SLUG = 'backup';