Upgrade to GitHub-native Dependabot

.github/dependabot.yml

@@ -0,0 +1,24 @@
+version: 2
+updates:
+- package-ecosystem: cargo
+  directory: "/"
+  schedule:
+    interval: weekly
+    time: "00:00"
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: reqwest
+    versions:
+    - 0.11.1
+    - 0.11.2
+  - dependency-name: serde
+    versions:
+    - 1.0.123
+    - 1.0.124
+  - dependency-name: serde_json
+    versions:
+    - 1.0.62
+  - dependency-name: log
+    versions:
+    - 0.4.13
+  rebase-strategy: disabled