Fix issue spotted by PHPStan on the CI [#3445945]

Problem/Motivation

$ php vendor/bin/phpstan analyze $_WEB_ROOT/modules/custom/$CI_PROJECT_NAME $PHPSTAN_CONFIGURATION --no-progress || EXIT_CODE=$?
 ------ ---------------------------------------------------------------------- 
  Line   src/DrupalGuzzleCache.php                                             
 ------ ---------------------------------------------------------------------- 
  62     Class Drupal\Core\Cache\BackendChain does not have a constructor and  
         must be instantiated without any parameters.                          
 ------ ---------------------------------------------------------------------- 
 [ERROR] Found 1 error

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Issue fork guzzle_cache-3445945

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3445945-fix-issue-spotted changes, plain diff MR !6
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