add quotes to field if numeric in safe_cast macro

dbt/include/snowflake/macros/utils/safe_cast.sql

@@ -1,3 +1,4 @@
 {% macro snowflake__safe_cast(field, type) %}
-    try_cast({{field}} as {{type}})
-{% endmacro %}
+    {% set field_as_string =  "'" ~ field ~ "'" if field is number else field%}
+    try_cast({{field_as_string}} as {{type}})
+{% endmacro %}