ci: skip test_maps on s390x

It's flaky and OOMs pretty frequently. We get lots of signal on x86-64,
so let's disable it on s390x.

Signed-off-by: Andrii Nakryiko <[email protected]>

Author: anakryiko

.github/scripts/matrix.py

@@ -91,10 +91,12 @@ def tests(self) -> Dict[str, Any]:
             "test_progs_parallel",
             "test_progs_no_alu32",
             "test_progs_no_alu32_parallel",
-            "test_maps",
             "test_verifier",
         ]
 
+        if self.arch.value != "s390x":
+            tests_list.append("test_maps")
+
         if self.toolchain.version >= 18:
             tests_list.append("test_progs_cpuv4")