chore(deps): remove Dockerfiles from Dependabot configuration

Author: mrz1836

.github/dependabot.yml

@@ -3,7 +3,7 @@
 # Repo: mrz1836/<repo>
 #
 # Purpose:
-#   • Keep Go modules, GitHub Actions, DevContainer images/features, and Docker
+#   • Keep Go modules, GitHub Actions and DevContainer images/features
 #     base images up‑to‑date with zero‑day security patches and semantic‑version
 #     upgrades.
 #   • Reduce attack surface by limiting outdated dependencies.
@@ -100,29 +100,3 @@ updates:
     commit-message:
       prefix: "chore"
       include: "scope"
-
-  # ──────────────────────────────────────────────────────────────
-  # 4. Dockerfiles (any Dockerfile in repo root or sub‑dirs)
-  # ──────────────────────────────────────────────────────────────
-  - package-ecosystem: "docker"
-    directory: "/"
-    target-branch: "master"
-    schedule:
-      interval: "weekly"
-      day: "monday"
-      time: "09:45"
-      timezone: "America/New_York"
-    allow:
-      - dependency-type: "direct"
-    ignore:
-      - dependency-name: "alpine"
-      - dependency-name: "scratch"
-    groups:
-      dockerfiles-all:
-        patterns: ["*"]
-    open-pull-requests-limit: 5
-    assignees: ["mrz1836"]
-    labels: ["chore", "dependencies", "docker"]
-    commit-message:
-      prefix: "chore"
-      include: "scope"