chore: Update dependabot (#108)

Uses a `lockfile-only` strategy

Author: nabetti1720

.github/dependabot.yml

@@ -1,12 +1,30 @@
 version: 2
 updates:
 - package-ecosystem: cargo
+  versioning-strategy: lockfile-only
   directory: "/"
+  allow:
+    - dependency-type: "all"
+  groups:
+    all-deps:
+      patterns:
+        - "*"
   schedule:
     interval: daily
-  open-pull-requests-limit: 10
+
+- package-ecosystem: cargo
+  versioning-strategy: lockfile-only
+  directory: "validation/local_ping_pong_openssl"
+  allow:
+    - dependency-type: "all"
+  groups:
+    all-deps:
+      patterns:
+        - "*"
+  schedule:
+    interval: daily
+
 - package-ecosystem: github-actions
   directory: "/"
   schedule:
     interval: weekly
-  open-pull-requests-limit: 10