@ (#4)

chore: update vulnerable dependencies and add Maven CI

Bump jackson-databind 2.15.2 -> 2.22.1, logback-classic 1.4.8 -> 1.5.38,
slf4j-api 2.0.7 -> 2.0.17, and netty-all 4.1.94 -> 4.1.136 to clear all
open Dependabot security advisories.

Add a GitHub Actions workflow building on JDK 11, and a .gitignore for
Maven/IDE artifacts.
@

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v4
+        with:
+          java-version: '11'
+          distribution: temurin
+          cache: maven
+
+      - name: Build
+        run: mvn -B --no-transfer-progress clean verify