fix: drop include:scope from dependabot commit-message config

The combination of `prefix: "chore(deps)"` and `include: "scope"`
produced `chore(deps)(deps):` — double scope. Removing `include`
keeps the prefix as-is.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/dependabot.yml

@@ -6,7 +6,6 @@ updates:
       interval: "monthly"
     commit-message:
       prefix: "chore(deps)"
-      include: "scope"
     groups:
       minor-and-patch:
         patterns: ["*"]
@@ -18,7 +17,6 @@ updates:
       interval: "monthly"
     commit-message:
       prefix: "chore(deps)"
-      include: "scope"
     groups:
       minor-and-patch:
         patterns: ["*"]
@@ -30,7 +28,6 @@ updates:
       interval: "monthly"
     commit-message:
       prefix: "chore(deps)"
-      include: "scope"
     groups:
       minor-and-patch:
         patterns: ["*"]