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

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 20e6bca38..b12102635 100644
--- a/README.md
+++ b/README.md
@@ -58,7 +58,7 @@ FreshRSS comes with absolutely no warranty.
 * Light server running Linux or Windows
 	* It even works on Raspberry Pi 1 with response time under a second (tested with 150 feeds, 22k articles)
 * A web server: Apache2 (recommended), nginx, lighttpd (not tested on others)
-* PHP 7.2+
+* PHP 7.4+
 	* Required extensions: [cURL](https://www.php.net/curl), [DOM](https://www.php.net/dom), [JSON](https://www.php.net/json), [XML](https://www.php.net/xml), [session](https://www.php.net/session), [ctype](https://www.php.net/ctype), and [PDO_MySQL](https://www.php.net/pdo-mysql) or [PDO_SQLite](https://www.php.net/pdo-sqlite) or [PDO_PGSQL](https://www.php.net/pdo-pgsql)
 	* Recommended extensions: [GMP](https://www.php.net/gmp) (for API access on 32-bit platforms), [IDN](https://www.php.net/intl.idn) (for Internationalized Domain Names), [mbstring](https://www.php.net/mbstring) (for Unicode strings), [iconv](https://www.php.net/iconv) (for charset conversion), [ZIP](https://www.php.net/zip) (for import/export), [zlib](https://www.php.net/zlib) (for compressed feeds)
 * MySQL 5.5.3+ or MariaDB equivalent, or SQLite 3.7.4+, or PostgreSQL 9.5+