Set cooldown for dependency updates to 7 days

Added cooldown period of 7 days for dependency updates.

Author: sue445

.github/dependabot.yml

@@ -11,6 +11,8 @@ updates:
       interval: weekly
       time: "05:00"
       timezone: Asia/Tokyo
+    cooldown:
+      default-days: 7
     assignees:
       - sue445
 
@@ -20,6 +22,8 @@ updates:
       interval: weekly
       time: "05:00"
       timezone: Asia/Tokyo
+    cooldown:
+      default-days: 7
     open-pull-requests-limit: 99
     assignees:
       - sue445
@@ -34,6 +38,8 @@ updates:
       interval: weekly
       time: "05:00"
       timezone: Asia/Tokyo
+    cooldown:
+      default-days: 7
     open-pull-requests-limit: 99
     assignees:
       - sue445
@@ -48,6 +54,8 @@ updates:
       interval: weekly
       time: "05:00"
       timezone: Asia/Tokyo
+    cooldown:
+      default-days: 7
     open-pull-requests-limit: 99
     assignees:
       - sue445