changed severity of G-3145 to blocker

because changing the underlying data structure can
lead to a bug.

Author: PhilippSalvisberg

docs/4-language-usage/3-dml-and-sql/1-general/g-3145.md

@@ -1,6 +1,6 @@
 # G-3145: Avoid using SELECT * directly from a table or view.
 
-!!! danger "Critical"
+!!! bug "Blocker"
     Efficiency, Maintainability, Reliability, Testability
 
 ## Reason