revert: Bad dependabot config (open-telemetry#1720)

* revert: Fix dependabot syntax error (open-telemetry#1719)

This reverts commit 60a630c.

* revert: Configure Dependabot to update recursively (open-telemetry#1718)

This reverts commit 2db52ff.

Author: arielvalentin

.github/dependabot.yml

@@ -6,7 +6,10 @@ updates:
     schedule:
       interval: daily
   - package-ecosystem: bundler
-    directories:
-      - "**/*"
+    directory: "/"
     schedule:
       interval: weekly
+    groups:
+      all-gems:
+        patterns:
+          - "**/Gemfile"