Do not label Dependabot PRs with "builds"

Unlike rgbds, rgbds-www does not have such a label
(its only labels are GitHub's predefined ones)

Author: Rangi42

.github/dependabot.yml

@@ -11,4 +11,3 @@ updates:
     groups:
       actions:
         patterns: [ "*" ]
-    labels: [ builds ] # Since those are CI-related updates...