Update php-qrcode and php-settings-container for PHP 8.1

By running the following command after updating composer.json

```
composer update chillerlan/php-qrcode chillerlan/php-settings-container
```

This change fixes a deprecation warning from Preferences ->
Personal data / Authentication -> Authenticator (OTP).

```
Return type of chillerlan\Settings\SettingsContainerAbstract::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
1. vendor/chillerlan/php-settings-container/src/SettingsContainerAbstract.php(19): ttrss_error_handler(Return type of chillerlan\Settings\SettingsContainerAbstract::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice, vendor/chillerlan/php-settings-container/src/SettingsContainerAbstract.php)
2. vendor/composer/ClassLoader.php(571): include(/usr/share/webapps/tt-rss/vendor/chillerlan/php-settings-container/src/SettingsContainerAbstract.php)
3. vendor/composer/ClassLoader.php(428): Composer\Autoload\includeFile(/usr/share/webapps/tt-rss/vendor/composer/../chillerlan/php-settings-container/src/SettingsContainerAbstract.php)
4. vendor/chillerlan/php-qrcode/src/QROptions.php(59): loadClass(chillerlan\Settings\SettingsContainerAbstract)
5. vendor/composer/ClassLoader.php(571): include(/usr/share/webapps/tt-rss/vendor/chillerlan/php-qrcode/src/QROptions.php)
6. vendor/composer/ClassLoader.php(428): Composer\Autoload\includeFile(/usr/share/webapps/tt-rss/vendor/composer/../chillerlan/php-qrcode/src/QROptions.php)
7. vendor/chillerlan/php-qrcode/src/QRCode.php(113): loadClass(chillerlan\QRCode\QROptions)
8. classes/pref/prefs.php(958): __construct()
9. classes/pref/prefs.php(469): _get_otp_qrcode_img()
10. classes/pref/prefs.php(541): index_auth_2fa()
11. backend.php(136): index_auth()
```

The issue is fixed in php-settings-container 2.1.1 [1] Here I use the
latest php-qrcode version for another PHP 8.1 fix [2].

[1] https://github.com/chillerlan/php-settings-container/commit/68bc5019c8b38956c83906431ef879668366b036#diff-359c7f7a6d32d9935951e1b0742eb116fb654f4a932c8d40328bb5dcab2fa111L162
[2] https://github.com/chillerlan/php-qrcode/issues/97

vendor/chillerlan/php-settings-container/examples/advanced.php

@@ -1,6 +1,5 @@
 <?php
 /**
- * @filesource   advanced.php
  * @created      28.08.2018
  * @author       smiley <smiley@chillerlan.net>
  * @copyright    2018 smiley
@@ -15,7 +14,7 @@ require_once __DIR__.'/../vendor/autoload.php';
 
 // from library #1
 trait SomeOptions{
-	protected $foo;
+	protected string $foo = '';
 
 	// this method will be called in SettingsContainerAbstract::__construct() after the properties have been set
 	protected function SomeOptions(){
@@ -26,7 +25,7 @@ trait SomeOptions{
 
 // from library #2
 trait MoreOptions{
-	protected $bar = 'whatever'; // provide default values
+	protected string $bar = 'whatever'; // provide default values
 }
 
 $commonOptions = [
@@ -37,10 +36,16 @@ $commonOptions = [
 ];
 
 // now plug the several library options together to a single object
-/** @var \chillerlan\Settings\SettingsContainerInterface $container */
-$container = new class ($commonOptions) extends SettingsContainerAbstract{
+
+/**
+ * @property string $foo
+ * @property string $bar
+ */
+class MySettings extends SettingsContainerAbstract{
 	use SomeOptions, MoreOptions; // ...
 };
 
+$container = new MySettings($commonOptions);
+
 var_dump($container->foo); // -> WHATEVER (constructor ran strtoupper on the value)
 var_dump($container->bar); // -> nothing

vendor/chillerlan/php-settings-container/examples/simple.php

@@ -1,6 +1,5 @@
 <?php
 /**
- * @filesource   simple.php
  * @created      28.08.2018
  * @author       smiley <smiley@chillerlan.net>
  * @copyright    2018 smiley