Add February patch releases to the calendar

Signed-off-by: Marko Mudrinić <mudrinic.mare@gmail.com>

data/releases/schedule.yaml

@@ -4,10 +4,15 @@ schedules:
   maintenanceModeStartDate: 2023-12-28
   endOfLifeDate: 2024-02-28
   next:
-    release: 1.26.2
-    cherryPickDeadline: 2023-02-10
-    targetDate: 2023-02-15
+    release: 1.26.3
+    cherryPickDeadline: 2023-03-10
+    targetDate: 2023-03-15
   previousPatches:
+    - release: 1.26.2
+      cherryPickDeadline: 2023-02-10
+      targetDate: 2023-02-15
+      note: >-
+        [Some container images might be **unsigned** due to a temporary issue with the promotion process](https://groups.google.com/a/kubernetes.io/g/dev/c/MwSx761slM0/m/4ajkeUl0AQAJ)
     - release: 1.26.1
       cherryPickDeadline: 2023-01-13
       targetDate: 2023-01-18
@@ -19,10 +24,15 @@ schedules:
   maintenanceModeStartDate: 2023-08-28
   endOfLifeDate: 2023-10-28
   next:
-    release: 1.25.7
-    cherryPickDeadline: 2023-02-10
-    targetDate: 2023-02-15
+    release: 1.25.8
+    cherryPickDeadline: 2023-03-10
+    targetDate: 2023-03-15
   previousPatches:
+    - release: 1.25.7
+      cherryPickDeadline: 2023-02-10
+      targetDate: 2023-02-15
+      note: >-
+        [Some container images might be **unsigned** due to a temporary issue with the promotion process](https://groups.google.com/a/kubernetes.io/g/dev/c/MwSx761slM0/m/4ajkeUl0AQAJ)
     - release: 1.25.6
       cherryPickDeadline: 2023-01-13
       targetDate: 2023-01-18
@@ -53,10 +63,15 @@ schedules:
   maintenanceModeStartDate: 2023-05-28
   endOfLifeDate: 2023-07-28
   next:
-    release: 1.24.11
-    cherryPickDeadline: 2023-02-10
-    targetDate: 2023-02-15
+    release: 1.24.12
+    cherryPickDeadline: 2023-03-10
+    targetDate: 2023-03-15
   previousPatches:
+    - release: 1.24.11
+      cherryPickDeadline: 2023-02-10
+      targetDate: 2023-02-15
+      note: >-
+        [Some container images might be **unsigned** due to a temporary issue with the promotion process](https://groups.google.com/a/kubernetes.io/g/dev/c/MwSx761slM0/m/4ajkeUl0AQAJ)
     - release: 1.24.10
       cherryPickDeadline: 2023-01-13
       targetDate: 2023-01-18