Dependabot: Make sure to ignore all the Substrate deps (#1021)

cumulus/.github/dependabot.yml

@@ -3,5 +3,19 @@ updates:
   - package-ecosystem: "cargo"
     directory: "/"
     labels: ["A2-insubstantial", "B0-silent", "C1-low 📌"]
+    # Handle updates for crates from github.com/paritytech/substrate manually.
+    ignore:
+      - dependency-name: "substrate-*"
+      - dependency-name: "sc-*"
+      - dependency-name: "sp-*"
+      - dependency-name: "frame-*"
+      - dependency-name: "fork-tree"
+      - dependency-name: "remote-externalities"
+      - dependency-name: "pallet-*"
+      - dependency-name: "beefy-*"
+      - dependency-name: "try-runtime-*"
+      - dependency-name: "test-runner"
+      - dependency-name: "generate-bags"
+      - dependency-name: "sub-tokens"
     schedule:
       interval: "daily"