Update FirebaseStorage.podspec

Co-authored-by: Nick Cooke <36927374+ncooke3@users.noreply.github.com>

Author: paulb777

FirebaseStorage.podspec

@@ -57,7 +57,7 @@ Firebase Storage provides robust, secure file uploads and downloads from Firebas
  objc_tests.requires_app_host = true
  objc_tests.resources = 'FirebaseStorage/Tests/Integration/Resources/1mb.dat',
  'FirebaseStorage/Tests/Integration/Resources/GoogleService-Info.plist'
- objc_tests.dependency 'FirebaseAuth', '~> 8.0'
+ objc_tests.dependency 'FirebaseAuth', '~> 8.13'
  objc_tests.pod_target_xcconfig = {
  'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'
  }