Doc min php8 (#4856)

* Update PHP requirement to version 8.

* fix: update PHP requirement from 8.0+ to 8.1+

Author: kiatng

docs/content/users/requirements.md

@@ -7,16 +7,14 @@ tags:
 
 # Requirements
 
-- PHP 7.4+
-    - PHP 8.0 is supported
-    - PHP 8.1 supported but some warnings may be shown/logged
-    - PHP 8.2 is usable but still being tested
+- PHP 8.1+[^1]
+    - PHP 8.4 supported but some warnings may be shown/logged
 - MySQL 5.6+ (8.0+ recommended) or MariaDB
 - optional: Redis 5.x, 6.x and 7.0.x are supported
 
+- PHP extension `intl`[^2]
+- Command `patch` 2.7+ (or `gpatch` on macOS/Homebrew)[^3]
 
-- PHP extension `intl`[^1]
-- Command `patch` 2.7+ (or `gpatch` on macOS/Homebrew)[^2]
-
-[^1]: since 1.9.4.19 & 20.0.17
-[^2]: since 1.9.5.0 & 20.1.0
+[^1]: since 20.14.0
+[^2]: since 1.9.4.19 & 20.0.17
+[^3]: since 1.9.5.0 & 20.1.0