Fix ensure_collection_table query_stats column types (#547)

Missed the third copy of the query_stats schema in
06_ensure_collection_table.sql — same smallint/integer -> bigint
fix for min_dop, max_dop, and thread columns.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: erikdarlingdata

install/06_ensure_collection_table.sql

@@ -216,18 +216,18 @@ BEGIN
         max_rows bigint NOT NULL,
         statement_sql_handle varbinary(64) NULL,
         statement_context_id bigint NULL,
-        min_dop smallint NOT NULL,
-        max_dop smallint NOT NULL,
+        min_dop bigint NOT NULL,
+        max_dop bigint NOT NULL,
         min_grant_kb bigint NOT NULL,
         max_grant_kb bigint NOT NULL,
         min_used_grant_kb bigint NOT NULL,
         max_used_grant_kb bigint NOT NULL,
         min_ideal_grant_kb bigint NOT NULL,
         max_ideal_grant_kb bigint NOT NULL,
-        min_reserved_threads integer NOT NULL,
-        max_reserved_threads integer NOT NULL,
-        min_used_threads integer NOT NULL,
-        max_used_threads integer NOT NULL,
+        min_reserved_threads bigint NOT NULL,
+        max_reserved_threads bigint NOT NULL,
+        min_used_threads bigint NOT NULL,
+        max_used_threads bigint NOT NULL,
         total_spills bigint NOT NULL,
         min_spills bigint NOT NULL,
         max_spills bigint NOT NULL,