ci(deps): bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Setup .NET
       uses: actions/setup-dotnet@v3

.github/workflows/container.yml

@@ -23,7 +23,7 @@ jobs:
         jellyfin-web-version: [10.8.10]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
@@ -43,7 +43,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-node-
       - name: Checkout modified web interface
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: ConfusedPolarBear/jellyfin-web
           ref: intros

.github/workflows/publish.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
     # set fetch-depth to 0 in order to clone all tags instead of just the current commit
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0