Revert "Enable Dependabot for cargo, pip, and GitHub Actions"

This reverts commit a49ff6a.

Author: bangseongbeom

.github/dependabot.yml

@@ -6,22 +6,7 @@
 
 version: 2
 updates:
-  - package-ecosystem: "pip"
-    directory: "/"
-    schedule:
-      interval: weekly
-
-  - package-ecosystem: "cargo"
-    directory: "/"
-    schedule:
-      interval: weekly
-
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: weekly
-
-  - package-ecosystem: "devcontainers"
-    directory: "/"
-    schedule:
-      interval: weekly
+ - package-ecosystem: "devcontainers"
+   directory: "/"
+   schedule:
+     interval: weekly