Update defense_evasion_posh_assembly_load.toml (#4543)

Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>

rules/windows/defense_evasion_posh_assembly_load.toml

@@ -4,7 +4,7 @@ integration = ["windows"]
 maturity = "production"
 min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."
 min_stack_version = "8.14.0"
-updated_date = "2025/02/03"
+updated_date = "2025/03/19"
 
 [transform]
 [[transform.osquery]]
@@ -133,8 +133,7 @@ event.category:process and host.os.type:windows and
   powershell.file.script_block_text : (
     "[System.Reflection.Assembly]::Load" or
     "[Reflection.Assembly]::Load" or
-    "Assembly.Load(" or
-    "System.Reflection"
+    "Assembly.Load("
   ) and
   not powershell.file.script_block_text : (
         ("CommonWorkflowParameters" or "RelatedLinksHelpInfo") and