fix(disk_perf): usage of double quote in nested string

Signed-off-by: Mathieu Labourier <[email protected]>

Author: Millefeuille42

tests/storage/benchmarks/test_disk_perf.py

@@ -11,7 +11,7 @@
 
 # Tests default settings #
 
-CSV_FILE = f"/tmp/results_{datetime.now().strftime("%Y-%m-%d_%H:%M:%S")}.csv"
+CSV_FILE = f"/tmp/results_{datetime.now().strftime('%Y-%m-%d_%H:%M:%S')}.csv"
 
 DEFAULT_SAMPLES_NUM = 10
 DEFAULT_SIZE = "1G"