Run-checker merge CI: Memleak test does not work without ubsan

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from #19874)

(cherry picked from commit 1ca61aa)

.github/workflows/run-checker-merge.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         opt: [
-          enable-asan no-shared no-asm -DOPENSSL_SMALL_FOOTPRINT,
+          enable-asan enable-ubsan no-shared no-asm -DOPENSSL_SMALL_FOOTPRINT,
           no-dgram,
           no-dso,
           no-dynamic-engine,