CI: upgrade actions/checkout to v6

Author: Morwenn

.forgejo/workflows/deploy-to-wiki.yml

@@ -25,7 +25,7 @@ jobs:
           path: main
 
       - name: Checkout wiki
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: ${{forgejo.repository}}.wiki
           path: wiki

.github/workflows/code-coverage.yml

@@ -1,4 +1,4 @@
-# Copyright (c) 2020-2025 Morwenn
+# Copyright (c) 2020-2026 Morwenn
 # SPDX-License-Identifier: MIT
 
 name: Coverage Upload to Codecov
@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout project
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - uses: rui314/setup-mold@v1
 
       - name: Install LCOV

.github/workflows/deploy-to-wiki.yml

@@ -1,4 +1,4 @@
-# Copyright (c) 2020-2025 Morwenn
+# Copyright (c) 2020-2026 Morwenn
 # SPDX-License-Identifier: MIT
 
 name: Wiki Deployment
@@ -19,13 +19,13 @@ jobs:
 
     steps:
       - name: Checkout /docs
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: ${{github.repository}}
           path: main
 
       - name: Checkout wiki
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: ${{github.repository}}.wiki
           path: wiki

.github/workflows/mirror-to-codeberg.yml

@@ -1,4 +1,4 @@
-# Copyright (c) 2025 Morwenn
+# Copyright (c) 2025-2026 Morwenn
 # SPDX-License-Identifier: MIT
 
 name: Mirror Commits to Codeberg
@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0