chore(deps): update actions/checkout action to v6

.github/workflows/gh-pages.yml

@@ -9,7 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
         with:
           submodules: true  # Fetch Hugo themes (true OR recursive)
           fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod

.github/workflows/image-action-schedule.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
       - name: Compress Images
         id: calibre
         uses: calibreapp/image-actions@main

.github/workflows/image-actions-on-PR.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Compress Images
         uses: calibreapp/image-actions@main

.github/workflows/markdown-lint.yml

@@ -9,7 +9,7 @@ jobs:
     name: Linting Markdown
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
         name: Check out the code
       - name: Lint Code Base
         uses: docker://avtodev/markdown-lint:v1

.github/workflows/markdown-spellcheck.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Spell checking Markdown
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
         name: Check out the code
       - uses: actions/setup-node@v3
         name: Run spell check