Remove redundant cargo dependencies in dependabot.yml

This change eliminates multiple unnecessary cargo dependency blocks from the dependabot.yml configuration file. The modification ensures only the relevant dependencies are maintained, streamlining the dependency management process.

.github/dependabot.yml

@@ -15,28 +15,4 @@ updates:
     schedule:
       interval: "weekly"
     assignees:
-      - "smyrgeorge"
-  - package-ecosystem: "cargo"
-    directory: "/sqlx4k/rust_lib"
-    schedule:
-      interval: "weekly"
-    assignees:
-      - "smyrgeorge"
-  - package-ecosystem: "cargo"
-    directory: "/sqlx4k-mysql/rust_lib"
-    schedule:
-      interval: "weekly"
-    assignees:
-      - "smyrgeorge"
-  - package-ecosystem: "cargo"
-    directory: "/sqlx4k-postgres/rust_lib"
-    schedule:
-      interval: "weekly"
-    assignees:
-      - "smyrgeorge"
-  - package-ecosystem: "cargo"
-    directory: "/sqlx4k-sqlite/rust_lib"
-    schedule:
-      interval: "weekly"
-    assignees:
-      - "smyrgeorge"
+      - "smyrgeorge"