Merge pull request #10652 from Icinga/backport-10634-to-support/2.14

[Backport support/2.14] Bump actions/checkout from 5 to 6

Author: yhabteab

.github/workflows/authors-file.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - name: Checkout HEAD
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/linux.yml

@@ -64,7 +64,7 @@ jobs:
 
     steps:
       - name: Checkout HEAD
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Restore/backup ccache
         uses: actions/cache@v3

.github/workflows/windows.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout HEAD
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0