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] 68bc5019c8 (diff-359c7f7a6d32d9935951e1b0742eb116fb654f4a932c8d40328bb5dcab2fa111L162)
[2] https://github.com/chillerlan/php-qrcode/issues/97

vendor/chillerlan/php-qrcode/.github/workflows/tests.yml

@@ -2,8 +2,12 @@
 # https://github.com/sebastianbergmann/phpunit/blob/master/.github/workflows/ci.yml
 
 on:
-  - pull_request
-  - push
+  push:
+    branches:
+      - v4.3.x
+  pull_request:
+    branches:
+      - v4.3.x
 
 name: "Continuous Integration"
 
@@ -46,14 +50,17 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-#          - windows-latest
+          - windows-latest
         php-version:
-          - "7.2"
-          - "7.3"
           - "7.4"
           - "8.0"
+          - "8.1"
 
     steps:
+#      - name: "Configure git to avoid issues with line endings"
+#        if: matrix.os == 'windows-latest'
+#        run: git config --global core.autocrlf false
+
       - name: "Checkout"
         uses: actions/checkout@v2
 
@@ -69,7 +76,7 @@ jobs:
         run: composer update --no-ansi --no-interaction --no-progress --no-suggest
 
       - name: "Run tests with phpunit"
-        run: php vendor/phpunit/phpunit/phpunit --configuration=phpunit.xml
+        run: php vendor/bin/phpunit --configuration=phpunit.xml
 
       - name: "Send code coverage report to Codecov.io"
         uses: codecov/codecov-action@v1