Add missing Oanda, SGX and Cfd-InteractiveBrokers 2026 holidays to MHDB (QuantConnect#9204)

* Add 2026 Oanda holidays

* Add 2026 new year holiday SGX

* Add Cfd-interactivebrokers 2026 holidays

* Remove wrong holidays in Forex-oanda-[*]

* Nit change

Author: Marinovsky

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

@@ -79106,7 +79106,9 @@
         "12/26/2022",
         "12/31/2022",
         "1/1/2025",
-        "4/18/2025"
+        "4/18/2025",
+        "12/25/2025",
+        "1/1/2026"
       ],
       "earlyCloses": {
         "2/15/2018": "12:00:00",
@@ -79656,8 +79658,6 @@
         "1/1/2021",
         "1/1/2023",
         "1/2/2023",
-        "1/1/2024",
-        "1/1/2025",
         "12/25/2010",
         "12/25/2012",
         "12/25/2015",
@@ -79666,9 +79666,7 @@
         "12/25/2022",
         "12/26/2022",
         "12/24/2023",
-        "12/31/2023",
-        "12/25/2024",
-        "12/25/2025"
+        "12/31/2023"
       ],
       "earlyCloses": {
         "12/30/2005": "17:00:00",
@@ -79703,9 +79701,10 @@
         "1/1/2020": "17:00:00",
         "12/25/2023": "17:00:00",
         "1/1/2024": "17:00:00",
-        "12/25/2024": "17:00:00",
-        "1/1/2025": "17:00:00",
-        "12/25/2025": "17:00:00"
+        "12/25/2024": "17:05:00",
+        "1/1/2025": "17:05:00",
+        "12/25/2025": "17:05:00",
+        "1/1/2026": "17:05:00"
       }
     },
     "Forex-oanda-GBPNZD": {
@@ -88876,6 +88875,7 @@
         "1/1/2024",
         "1/2/2023",
         "1/1/2025",
+        "1/1/2026",
         "1/2/2007",
         "1/19/1998",
         "1/18/1999",
@@ -88905,6 +88905,7 @@
         "1/16/2023",
         "1/15/2024",
         "1/20/2025",
+        "1/19/2026",
         "2/16/1998",
         "2/15/1999",
         "2/21/2000",
@@ -88933,6 +88934,7 @@
         "2/20/2023",
         "2/19/2024",
         "2/17/2025",
+        "2/16/2026",
         "4/10/1998",
         "4/2/1999",
         "4/21/2000",
@@ -88961,6 +88963,7 @@
         "4/7/2023",
         "3/29/2024",
         "4/18/2025",
+        "4/3/2026",
         "5/25/1998",
         "5/31/1999",
         "5/29/2000",
@@ -88988,11 +88991,13 @@
         "5/30/2022",
         "5/29/2023",
         "5/27/2024",
+        "5/25/2026",
         "6/11/2004",
         "6/20/2022",
         "6/19/2023",
         "6/19/2024",
         "6/19/2025",
+        "6/19/2026",
         "7/3/1998",
         "7/5/1999",
         "7/4/2000",
@@ -89021,6 +89026,7 @@
         "7/4/2023",
         "7/4/2024",
         "7/4/2025",
+        "7/3/2026",
         "9/7/1998",
         "9/6/1999",
         "9/4/2000",
@@ -89049,6 +89055,7 @@
         "9/4/2023",
         "9/2/2024",
         "9/1/2025",
+        "9/7/2026",
         "9/11/2001",
         "9/12/2001",
         "9/13/2001",
@@ -89083,6 +89090,7 @@
         "11/23/2023",
         "11/28/2024",
         "11/27/2025",
+        "11/26/2026",
         "12/05/2018",
         "12/25/1998",
         "12/24/1999",
@@ -89111,7 +89119,8 @@
         "12/26/2022",
         "12/25/2023",
         "12/25/2024",
-        "12/25/2025"
+        "12/25/2025",
+        "12/25/2026"
       ],
       "earlyCloses": {
         "7/3/2000": "13:00:00",
@@ -89157,6 +89166,7 @@
         "11/24/2023": "13:00:00",
         "11/29/2024": "13:00:00",
         "11/28/2025": "13:00:00",
+        "11/27/2026": "13:00:00",
         "12/24/2001": "13:00:00",
         "12/24/2002": "13:00:00",
         "12/24/2003": "13:00:00",
@@ -89173,7 +89183,8 @@
         "12/24/2019": "13:00:00",
         "12/24/2020": "13:00:00",
         "12/24/2024": "13:00:00",
-        "12/24/2025": "13:00:00"
+        "12/24/2025": "13:00:00",
+        "12/24/2026": "13:00:00"
       }
     },
     "Cfd-interactivebrokers-IBUS500": {