vecindex: bump test size under race

Closes #145299

Epic: none
Release note: None

Author: rickystewart

pkg/sql/vecindex/BUILD.bazel

@@ -50,6 +50,10 @@ go_test(
     ],
     data = ["//pkg/sql/vecindex/cspann:features_10000"],
     embed = [":vecindex"],
+    exec_properties = select({
+        "//build/toolchains:is_heavy": {"test.Pool": "large"},
+        "//conditions:default": {"test.Pool": "default"},
+    }),
     deps = [
         "//pkg/base",
         "//pkg/ccl",