actions: update checkout to v6

Author: GIC-de

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
         os: [ubuntu-22.04, ubuntu-24.04]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Download RtBrick libdict
       shell: bash
@@ -80,7 +80,7 @@ jobs:
         os: [bookworm, trixie]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Install dependencies
       shell: bash

.github/workflows/codeql-analysis.yml

@@ -35,7 +35,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/release.yml

@@ -21,7 +21,7 @@ jobs:
           echo "SOURCE_BRANCH=${GITHUB_REF#refs/heads/}" >> $GITHUB_OUTPUT
           echo "SOURCE_TAG=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
 
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ncipollo/release-action@v1
       with:
         tag: ${{ steps.ref_name.outputs.SOURCE_TAG }}
@@ -36,7 +36,7 @@ jobs:
         os: [ubuntu-22.04, ubuntu-24.04]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Download RtBrick libdict
       shell: bash
@@ -106,7 +106,7 @@ jobs:
         os: [bookworm, trixie]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Install dependencies
       shell: bash