Update guzzlehttp/guzzle version to ^7.15.1

[shishir-intelli]

Fix
https://github.com/apigee/apigee-edge-drupal/security/dependabot/11
https://github.com/apigee/apigee-edge-drupal/security/dependabot/9
https://github.com/apigee/apigee-edge-drupal/security/dependabot/5
https://github.com/apigee/apigee-edge-drupal/security/dependabot/6
https://github.com/apigee/apigee-edge-drupal/security/dependabot/10
https://github.com/apigee/apigee-edge-drupal/security/dependabot/7
https://github.com/apigee/apigee-edge-drupal/security/dependabot/8

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.47%. Comparing base (8dd18df) to head (4f54d93).

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x    #1282      +/-   ##
============================================
+ Coverage     43.45%   43.47%   +0.01%     
  Complexity     3122     3122              
============================================
  Files           345      345              
  Lines         11390    11390              
============================================
+ Hits           4950     4952       +2     
+ Misses         6440     6438       -2     

see 1 file with indirect coverage changes

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