Upgrade to PHP 8.1 (#6711)

* Upgrade to PHP 8.1
As discussed in https://github.com/FreshRSS/FreshRSS/discussions/5474

https://www.php.net/releases/8.0/en.php
https://www.php.net/releases/8.1/en.php

Upgrade to available native type declarations
https://php.net/language.types.declarations

Upgrade to https://phpunit.de/announcements/phpunit-10.html which requires PHP 8.1+ (good timing, as version 9 was not maintained anymore)

Upgrade `:oldest` Docker dev image to oldest Alpine version supporting PHP 8.1: Alpine 3.16, which includes PHP 8.1.22.

* Include 6736
https://github.com/FreshRSS/FreshRSS/pull/6736

1 files changed, 2 insertions, 4 deletions

diff --git a/p/ext.php b/p/ext.php
index a9dee3756..5d95107da 100644
--- a/p/ext.php
+++ b/p/ext.php
@@ -83,14 +83,12 @@ function is_valid_path(string $path): bool {
 		|| is_valid_path_extension($path, USERS_PATH, false);
 }
 
-/** @return never */
-function sendBadRequestResponse(string $message = null) {
+function sendBadRequestResponse(string $message = null): never {
 	header('HTTP/1.1 400 Bad Request');
 	die($message);
 }
 
-/** @return never */
-function sendNotFoundResponse() {
+function sendNotFoundResponse(): never {
 	header('HTTP/1.1 404 Not Found');
 	die();
 }