Configure cooldown (#678)

Add a cooldown period before accepting updates from Dependabot.

Author: BillWagner

actions/dependabot-bot/src/dependabot-bot/Program.cs

@@ -38,6 +38,8 @@ Please update the config file to conform with Dependabot's specification.
         interval: "weekly"
         day: "wednesday"
       open-pull-requests-limit: 10
+      cooldown:
+       default-days: 7
   """;
 
 buffer.WriteLineToBufferAndOutput(gitHubActions, updateNodeCount++ >= UpdateNodeLimit);
@@ -52,6 +54,8 @@ Please update the config file to conform with Dependabot's specification.
       interval: ""weekly""
       day: ""wednesday""
   open-pull-requests-limit: 5
+  cooldown:
+    default-days: 7
   groups:
     # Group .NET updates together
     dotnet:
@@ -83,6 +87,8 @@ Please update the config file to conform with Dependabot's specification.
                   interval: "weekly"
                   day: "wednesday"
                 open-pull-requests-limit: 5
+                cooldown:
+                  default-days: 7
                 groups:
                   # Group .NET updates together for solutions.
                   dotnet:
@@ -135,6 +141,8 @@ Please update the config file to conform with Dependabot's specification.
                   interval: "weekly"
                   day: "wednesday"
                 open-pull-requests-limit: 5
+                cooldown:
+                  default-days: 7
                 groups:
                   # Group .NET updates together for projects.
                   dotnet: