Specify Labels for npm Updates

This brings the labels in line with the other dependency updates that
aren't of interest for the release notes. It also avoids adding labels
that aren't already defined by the project.

.github/dependabot.yml

@@ -164,24 +164,39 @@ updates:
     directory: /
     schedule:
       interval: weekly
+    labels:
+      - 'type: task'
+      - 'in: build'
 
   - package-ecosystem: npm
     target-branch: main
     directory: /docs
     schedule:
       interval: weekly
+    labels:
+      - 'type: task'
+      - 'in: build'
   - package-ecosystem: npm
     target-branch: 6.3.x
     directory: /docs
     schedule:
       interval: weekly
+    labels:
+      - 'type: task'
+      - 'in: build'
   - package-ecosystem: npm
     target-branch: 6.2.x
     directory: /docs
     schedule:
       interval: weekly
+    labels:
+      - 'type: task'
+      - 'in: build'
   - package-ecosystem: npm
     target-branch: 5.8.x
     directory: /docs
     schedule:
       interval: weekly
+    labels:
+      - 'type: task'
+      - 'in: build'