chore(deps): update actions/checkout action to v4 (#183)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/deploy.yml

@@ -10,7 +10,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: true # Fetch Hugo themes (true OR recursive)
           fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod

.github/workflows/linkcheck.yml

@@ -11,7 +11,7 @@ jobs:
   linkcheck:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive # Fetch Hugo themes (true OR recursive)
           fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod

.github/workflows/submodule.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event_name == 'pull_request'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive # Fetch Hugo themes (true OR recursive)
           fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event_name == 'pull_request'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive # Fetch Hugo themes (true OR recursive)
           fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod
@@ -56,7 +56,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive # Fetch Hugo themes (true OR recursive)
           fetch-depth: 0 # Fetch all history for .GitInfo and .Lastmod