Bump GH Actions versions and add Dependabot to monitor our dependencies.

Author: slachiewicz

.github/dependabot.yml

@@ -0,0 +1,14 @@
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "daily"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/codeql-analysis.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/maven.yml

@@ -3,21 +3,17 @@
 
 name: Java CI with Maven
 
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
+on: [push, pull_request]
 
 jobs:
   build:
 
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up JDK 11
-      uses: actions/setup-java@v2
+      uses: actions/setup-java@v3
       with:
         # TODO: Revert to '11'.
         # See https://github.com/ChargeTimeEU/Java-OCA-OCPP/pull/223#issuecomment-1328048028