fix(tests): use datetime.datetime.now() in GCP kms_key_rotation_enabled

[prowler-bot]

Backport

This will backport the following commits from master to v4.6:

• fix(tests): use `datetime.datetime.now()` in GCP `kms_key_rotation_enabled` (#5976)

Questions ?

Please refer to the Backport tool documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.94%. Comparing base (764f260) to head (d167a74).
Report is 3 commits behind head on v4.6.

Additional details and impacted files

@@            Coverage Diff             @@
##             v4.6    #6083      +/-   ##
==========================================
+ Coverage   89.92%   89.94%   +0.02%     
==========================================
  Files        1147     1147              
  Lines       35617    35617              
==========================================
+ Hits        32027    32035       +8     
+ Misses       3590     3582       -8     

Components	Coverage Δ
prowler	89.94% <ø> (+0.02%)	⬆️
api	∅ <ø> (∅)