ci: add update-lockfile workflow and dependabot config for Cargo

Author: Algorithm5838

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10

.github/workflows/update-lockfile.yml

@@ -0,0 +1,25 @@
+name: Update Cargo.lock
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  update-lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: personal
+
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+
+      - name: Run cargo update
+        run: cargo update
+
+      - uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: "chore: update Cargo.lock [skip ci]"
+          file_pattern: Cargo.lock