Outdated CI and Renovate configurations have been removed, and a new Dependabot configuration file for dependency management has been added.

.github/workflows/test.yml

@@ -0,0 +1,12 @@
+name: Test
+on: [push, pull_request]
+
+jobs:
+  test:
+    name: cargo test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo check --all
+      - run: cargo test --all-features