Remove duplicated dates (#9207)

Author: Marinovsky

Data/market-hours/market-hours-database.json

@@ -81063,7 +81063,6 @@
         "4/15/2022",
         "4/17/2006",
         "4/17/2017",
-        "4/17/2017",
         "4/17/2028",
         "4/18/2003",
         "4/18/2014",
@@ -81131,7 +81130,6 @@
         "5/6/2030",
         "5/7/2029",
         "6/5/2017",
-        "6/5/2017",
         "8/25/2025",
         "8/26/2019",
         "8/26/2024",
@@ -83563,7 +83561,6 @@
         "4/13/2020",
         "4/14/2006",
         "4/14/2017",
-        "4/14/2017",
         "4/14/2028",
         "4/15/2022",
         "4/17/2006",
@@ -84127,10 +84124,8 @@
         "2/4/2011",
         "2/4/2030",
         "2/5/2019",
-        "2/5/2019",
         "2/5/2030",
         "2/6/2019",
-        "2/6/2019",
         "2/6/2027",
         "2/6/2030",
         "2/7/2008",
@@ -84408,13 +84403,11 @@
         "1/1/2021",
         "1/1/2022",
         "1/1/2024",
-        "1/1/2024",
         "1/1/2025",
         "1/1/2026",
         "1/1/2027",
         "1/1/2028",
         "1/1/2029",
-        "1/1/2029",
         "1/1/2030",
         "1/10/2022",
         "1/10/2028",
@@ -84441,13 +84434,11 @@
         "1/3/2019",
         "1/3/2020",
         "1/3/2022",
-        "1/3/2022",
         "1/3/2023",
         "1/3/2024",
         "1/3/2025",
         "1/3/2026",
         "1/3/2028",
-        "1/3/2028",
         "1/3/2029",
         "1/3/2030",
         "1/4/2021",
@@ -84592,13 +84583,11 @@
         "5/31/2004",
         "5/4/2019",
         "5/4/2020",
-        "5/4/2020",
         "5/4/2021",
         "5/4/2022",
         "5/4/2023",
         "5/4/2024",
         "5/4/2026",
-        "5/4/2026",
         "5/4/2027",
         "5/4/2028",
         "5/4/2029",
@@ -84608,7 +84597,6 @@
         "5/5/2022",
         "5/5/2023",
         "5/5/2025",
-        "5/5/2025",
         "5/5/2026",
         "5/5/2027",
         "5/5/2028",
@@ -84667,7 +84655,6 @@
         "9/23/2026",
         "9/23/2027",
         "9/23/2030",
-        "9/23/2030",
         "9/24/2029",
         "9/6/2004"
       ]
@@ -85212,8 +85199,6 @@
         "2/19/2015",
         "2/8/2016",
         "1/30/2017",
-        "2/16/2018",
-        "2/5/2019",
         "1/27/2020",
         "4/14/2017",
         "1/2/2017",
@@ -121533,11 +121518,9 @@
         "4/12/2004",
         "5/1/2004",
         "12/24/2004",
-        "12/24/2004",
         "12/25/2004",
         "12/26/2004",
         "12/31/2004",
-        "12/31/2004",
         "3/25/2005",
         "3/28/2005",
         "12/26/2005",