ci: Remove not needed comment for unit tests (#2998)

Author: philipphofmann

.github/workflows/test.yml

@@ -78,9 +78,6 @@ jobs:
       fail-fast: false
       matrix:
         # Can't run tests on watchOS because XCTest is not available
-        # We can't use Xcode 11.7 as we use XCTestObservation. When building with Xcode 11.7
-        # we get the error 'XCTest/XCTest.h' not found. Setting ENABLE_TESTING_SEARCH_PATH=YES
-        # doesn't work.
         include:
 
           # iOS 13.7