Merge pull request #19230 from yoff/ruby/add-DeadStoreOfLocal-to-code-quality-suite

ruby: add `rb/useless-assignment-to-local` to the code-quality suite

Author: yoff

Diff for: ruby/ql/src/codeql-suites/ruby-code-quality.qls

@@ -1,4 +1,5 @@
 - queries: .
 - include:
     id:
-      - rb/database-query-in-loop
+      - rb/database-query-in-loop
+      - rb/useless-assignment-to-local