lecture: update checkout examples

Author: cagix

lecture/building/ci.md

@@ -283,7 +283,7 @@ jobs:
   job1:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-java@v3
         with:
           java-version: '17'
@@ -297,7 +297,7 @@ jobs:
     needs: job1
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-java@v3
         with:
           java-version: '17'
@@ -330,7 +330,7 @@ definieren jeweils einen Job.
     virtualisierten Ubuntu-Runner ausgeführt werden.
 
     Es wird zunächst das Repo mit Hilfe der Checkout-Action ausgecheckt
-    (`uses: actions/checkout@v5`), das JDK eingerichtet/installiert
+    (`uses: actions/checkout@v6`), das JDK eingerichtet/installiert
     (`uses: actions/setup-java@v3`) und der im Repo enthaltene Gradle-Wrapper auf
     Unversehrtheit geprüft (`uses: gradle/wrapper-validation-action@v1`).
 
@@ -429,7 +429,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
         - name: Checkout
-          uses: actions/checkout@v5
+          uses: actions/checkout@v6
         - name: Set up JDK 21
           uses: actions/setup-java@v4
           with:
@@ -444,7 +444,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
         - name: Checkout
-          uses: actions/checkout@v5
+          uses: actions/checkout@v6
         - name: Set up JDK 21
           uses: actions/setup-java@v4
           with:

lecture/building/docker.md

@@ -322,7 +322,7 @@ jobs:
         runs-on: ubuntu-latest
         container: docker://openjdk:17
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
             - run: java -version
             - run: javac Hello.java
             - run: java Hello

lecture/building/src/docker/.github/workflows/demo.yml

@@ -9,7 +9,7 @@ jobs:
         runs-on: ubuntu-latest
         container: docker://openjdk:17
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
             - run: java -version
             - run: javac Hello.java
             - run: java Hello