Fix sqlglot normalize benchmark

Conjunction string is changing in every iteration. Now, conjunction string is created for every iteration.

Author: AmirHesamSH

pyperformance/data-files/benchmarks/bm_sqlglot/run_benchmark.py

@@ -156,8 +156,8 @@ def bench_optimize(loops):
 
 def bench_normalize(loops):
     elapsed = 0
-    conjunction = parse_one("(A AND B) OR (C AND D) OR (E AND F) OR (G AND H)")
     for _ in range(loops):
+        conjunction = parse_one("(A AND B) OR (C AND D) OR (E AND F) OR (G AND H)")
         t0 = pyperf.perf_counter()
         normalize.normalize(conjunction)
         elapsed += pyperf.perf_counter() - t0