ci: Set Dependabot's cooldown (#1552)

Dependabot won't bump packages to versions that are less than 7 days
old.

Signed-off-by: Martin Kalcok <martin.kalcok@sap.com>

Author: mkalcok

.github/dependabot.yml

@@ -5,6 +5,8 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
     groups:
       go-dependencies:
         patterns:
@@ -16,6 +18,8 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
     groups:
       gh-actions-dependencies:
         patterns:
@@ -24,6 +28,8 @@ updates:
     directory: "/docs"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
     groups:
       pip-dependencies:
         patterns:
@@ -34,6 +40,8 @@ updates:
       - "/docs"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
     groups:
       docker-dependencies:
         patterns: