Bump WooCommerce minimum required PHP version to 7.4 (#39820)

-Change "Requires PHP":
  - In woocommerce.php
  - In readme.txt
  - In plugins/woocommerce-docs/woocommerce-docs.php
  - In packages/js/create-product-editor-block/plugin-templates/$slug.php.mustache

- Change "testVersion" in phpcs.xml:
  - In the root of the repository
  - In plugins/woocommerce
  - In plugins/woocommerce-beta-tester

- Change "require-php" and "config-platform-php" in composer.json
- Update composer.lock with more modern versions of some of the dependencies
- Remove the admin notice about the upcoming bump for PHP 7.3 users in class-wc-admin-notices.php

packages/js/create-product-editor-block/changelog/bump-required-php-to-7.4

@@ -0,0 +1,4 @@
+Significance: patch
+Type: dev
+
+Bump required PHP version to 7.4

packages/js/create-product-editor-block/plugin-templates/$slug.php.mustache

@@ -10,7 +10,7 @@
  * Version:              {{version}}
  * Requires at least:    6.2
  * WC requires at least: 7.8
- * Requires PHP:         7.3
+ * Requires PHP:         7.4
 {{#author}}
  * Author:               {{author}}
 {{/author}}

phpcs.xml

@@ -27,7 +27,7 @@
 
 	<!-- Configs -->
 	<config name="minimum_supported_wp_version" value="5.2" />
-	<config name="testVersion" value="7.3-" />
+	<config name="testVersion" value="7.4-" />
 
 	<!-- Rules -->
 	<rule ref="WooCommerce-Core" />

plugins/woocommerce-beta-tester/changelog/bump-required-php-to-7.4

@@ -0,0 +1,4 @@
+Significance: patch
+Type: dev
+
+Bump required PHP version to 7.4

plugins/woocommerce-beta-tester/phpcs.xml

@@ -17,7 +17,7 @@
 
 	<!-- Configs -->
 	<config name="minimum_supported_wp_version" value="5.2" />
-	<config name="testVersion" value="7.3-" />
+	<config name="testVersion" value="7.4-" />
 
 	<!-- Rules -->
 	<rule ref="WooCommerce-Core" />

plugins/woocommerce-docs/woocommerce-docs.php

@@ -9,7 +9,7 @@
  * Text Domain: woocommerce-docs
  * Domain Path: /i18n/languages/
  * Requires at least: 6.1
- * Requires PHP: 7.3
+ * Requires PHP: 7.4
  *
  * @package WooCommerce
  */

plugins/woocommerce/changelog/bump-required-php-to-7.4

@@ -0,0 +1,4 @@
+Significance: patch
+Type: dev
+
+Bump required PHP version to 7.4

plugins/woocommerce/composer.json

@@ -14,7 +14,7 @@
 		}
 	],
 	"require": {
-		"php": ">=7.3",
+		"php": ">=7.4",
 		"automattic/jetpack-autoloader": "2.11.18",
 		"automattic/jetpack-config": "1.15.2",
 		"automattic/jetpack-connection": "1.51.7",
@@ -42,7 +42,7 @@
 		},
 		"sort-packages": true,
 		"platform": {
-			"php": "7.3"
+			"php": "7.4"
 		},
 		"allow-plugins": {
 			"automattic/jetpack-autoloader": true,