chore: use directories to simplify dependabot config (#16241)

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

.github/dependabot.yml

@@ -1,9 +1,22 @@
 version: 2
 updates:
-  - package-ecosystem: "gomod"
+  - package-ecosystem: "docker"
     directory: "/"
     schedule:
       interval: "monthly"
+  - package-ecosystem: "github-actions"
+    directories:
+      - "/"
+      - "/scripts"
+    schedule:
+      interval: "monthly"
+  - package-ecosystem: "gomod"
+    directories:
+      - "/"
+      - "/documentation/examples/remote_storage"
+      - "/internal/tools"
+    schedule:
+      interval: "monthly"
     groups:
       k8s.io:
         patterns:
@@ -12,10 +25,6 @@ updates:
         patterns:
           - "go.opentelemetry.io/*"
     open-pull-requests-limit: 20
-  - package-ecosystem: "gomod"
-    directory: "/documentation/examples/remote_storage"
-    schedule:
-      interval: "monthly"
   # New manteen-ui packages.
   - package-ecosystem: "npm"
     directory: "/web/ui"
@@ -36,15 +45,3 @@ updates:
     schedule:
       interval: "monthly"
     open-pull-requests-limit: 20
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "monthly"
-  - package-ecosystem: "github-actions"
-    directory: "/scripts"
-    schedule:
-      interval: "monthly"
-  - package-ecosystem: "docker"
-    directory: "/"
-    schedule:
-      interval: "monthly"