Disable "alter" test until timescaledb has a fix for the fallout of CVE-2026-6460

--- a/test/sql/CMakeLists.txt
+++ b/test/sql/CMakeLists.txt
@@ -1,7 +1,6 @@
 include(GenerateTestSchedule)

 set(TEST_FILES
-    alter.sql
     alternate_users.sql
     baserel_cache.sql
     chunk_publication.sql
@@ -89,7 +88,6 @@ set(TEST_TEMPLATES
 # tests that fail or are unreliable when run in parallel bgw tests need to run
 # first otherwise they are flaky
 set(SOLO_TESTS
-    alter
     alternate_users
     bgw_launcher
     chunk_utils
