Require PHP 7.4+ (#5720)

* Require PHP 7.4+
https://github.com/FreshRSS/FreshRSS/discussions/5474

* Update Docker oldest
Alpine 3.13 with PHP 7.4.26

* Add missing packets to Docker oldest

* Update to typed properties
https://php.net/migration74.new-features#migration74.new-features.core.typed-properties

* More types

2 files changed, 11 insertions, 16 deletions

diff --git a/app/Services/ExportService.php b/app/Services/ExportService.php
index d3a3373a5..80531f3fc 100644
--- a/app/Services/ExportService.php
+++ b/app/Services/ExportService.php
@@ -4,20 +4,16 @@
  * Provide useful methods to generate files to export.
  */
 class FreshRSS_Export_Service {
-	/** @var string */
-	private $username;
 
-	/** @var FreshRSS_CategoryDAO */
-	private $category_dao;
+	private string $username;
 
-	/** @var FreshRSS_FeedDAO */
-	private $feed_dao;
+	private FreshRSS_CategoryDAO $category_dao;
 
-	/** @var FreshRSS_EntryDAO */
-	private $entry_dao;
+	private FreshRSS_FeedDAO $feed_dao;
 
-	/** @var FreshRSS_TagDAO */
-	private $tag_dao;
+	private FreshRSS_EntryDAO $entry_dao;
+
+	private FreshRSS_TagDAO $tag_dao;
 
 	public const FRSS_NAMESPACE = 'https://freshrss.org/opml';
 	public const TYPE_HTML_XPATH = 'HTML+XPath';
diff --git a/app/Services/ImportService.php b/app/Services/ImportService.php
index b70627295..9b013fea4 100644
--- a/app/Services/ImportService.php
+++ b/app/Services/ImportService.php
@@ -4,14 +4,13 @@
  * Provide methods to import files.
  */
 class FreshRSS_Import_Service {
-	/** @var FreshRSS_CategoryDAO */
-	private $catDAO;
 
-	/** @var FreshRSS_FeedDAO */
-	private $feedDAO;
+	private FreshRSS_CategoryDAO $catDAO;
 
-	/** @var bool true if success, false otherwise */
-	private $lastStatus;
+	private FreshRSS_FeedDAO $feedDAO;
+
+	/** true if success, false otherwise */
+	private bool $lastStatus;
 
 	/**
 	 * Initialize the service for the given user.