logictest: skip mixed_version_stats in 24.3 version

Recently merged commit jumped the gun on merging a change that is
incompatible with 24.3. We haven't yet removed
`cockroach-go-testserver-24.3` config so we skip it for now for the
mixed version stats test (the config isn't valid anymore but will be
removed some time soon).

Release note: None

Author: yuzefovich

pkg/sql/logictest/logictestbase/logictestbase.go

@@ -649,6 +649,8 @@ var DefaultConfigSets = map[string]ConfigSet{
 
 	// Special alias for all testserver configs (for mixed-version testing).
 	"cockroach-go-testserver-configs": makeConfigSet(
+		// TODO(yuzefovich): when removing 24.3 version from here, ensure to
+		// use the alias in mixed_version_stats.
 		"cockroach-go-testserver-24.3",
 		"cockroach-go-testserver-25.1",
 	),

pkg/sql/logictest/testdata/logic_test/mixed_version_stats

@@ -1,4 +1,4 @@
-# LogicTest: cockroach-go-testserver-configs
+# LogicTest: cockroach-go-testserver-25.1
 
 # This is a regression test for #137386 which verifies the hyperloglog library
 # upgrade for the table stats. We want such a distributed table stats collection

pkg/sql/logictest/tests/cockroach-go-testserver-24.3/BUILD.bazel

@@ -11,7 +11,7 @@ go_test(
         "//pkg/sql/logictest:testdata",  # keep
     ],
     exec_properties = {"test.Pool": "heavy"},
-    shard_count = 11,
+    shard_count = 10,
     tags = ["cpu:3"],
     deps = [
         "//pkg/base",