Update dependabot.yml

Author: vlbee

.github/dependabot.yml

@@ -1,7 +1,7 @@
 version: 2
 updates:
   - package-ecosystem: npm
-    directory: /cdk
+    directory: "/cdk"
     schedule:
       interval: "monthly"
     # The version of AWS CDK libraries must match those from @guardian/cdk.
@@ -11,7 +11,7 @@ updates:
       - dependency-name: "constructs"
 
   - package-ecosystem: npm
-    directory: /notificationworkerlambda/cdk
+    directory: "/notificationworkerlambda/cdk"
     schedule:
       interval: "monthly"
     # The version of AWS CDK libraries must match those from @guardian/cdk.
@@ -20,7 +20,7 @@ updates:
       - dependency-name: "aws-cdk-lib"
       - dependency-name: "constructs"
 
-  - package-ecosystem: github-actions
-    directory: /
+  - package-ecosystem: "github-actions"
+    directory: "/"
     schedule:
-      interval: weekly
+      interval: "weekly"