Upgrade to GitHub-native Dependabot (#18)

.dependabot/config.yml

@@ -1,5 +0,0 @@
-version: 1
-update_configs:
-  - package_manager: "go:modules"
-    directory: "/"
-    update_schedule: "daily"

.github/dependabot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+- package-ecosystem: gomod
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "19:00"
+  open-pull-requests-limit: 10