chore: update actions/setup-java to v3, checkout to v4, and matrix to LTS versions

Co-authored-by: GitHub Copilot <copilot@noreply.github.com>

Agent-Logs-Url: https://github.com/Staffbase/plugins-sdk-java/sessions/46736a26-2168-4ff1-b672-9387c5afdeb8

Co-authored-by: Ninerian <117885+Ninerian@users.noreply.github.com>

Author: Copilot

.github/workflows/cd.yml

@@ -13,12 +13,13 @@ jobs:
 
     steps:
     - name: Check out Git repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Install Java and Maven
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v3
       with:
-        java-version: 1.8
+        java-version: '8'
+        distribution: temurin
 
     - name: Release Maven package
       uses: samuelmeuli/action-maven-publish@v1

.github/workflows/ci.yml

@@ -12,15 +12,16 @@ jobs:
     name: Java ${{ matrix.java }} Test
     strategy:
       matrix:
-        # test against latest update of each major Java version, as well as specific updates of LTS versions:
-        java: [ 8, 10, 11, 12, 13, 14]
+        # test against LTS versions:
+        java: [ 8, 11, 17, 21 ]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Set up JDK ${{ matrix.java }}
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v3
       with:
         java-version: ${{ matrix.java }}
+        distribution: temurin
 
     - name: Get latest release tag
       id: latest_release