chore: refresh GitHub repository setup (#23)

* chore: refresh GitHub repository setup

* chore: align CI with Rust 1.88 MSRV

.github/branch-protection-main.json

@@ -3,12 +3,12 @@
     "strict": true,
     "contexts": [
       "cargo fmt --check",
-      "cargo clippy -- -D warnings",
+      "cargo clippy --all-targets -- -D warnings",
       "cargo check",
       "cargo test"
     ]
   },
-  "enforce_admins": true,
+  "enforce_admins": false,
   "required_pull_request_reviews": {
     "dismiss_stale_reviews": true,
     "required_approving_review_count": 1,