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](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
         run: sudo snap install snapcraft --classic
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: true
 
@@ -62,7 +62,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3 # [email protected]
+        uses: actions/checkout@v4 # [email protected]
         with:
           submodules: true
 

.github/workflows/ci.yml

@@ -71,7 +71,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3 # [email protected]
+        uses: actions/checkout@v4 # [email protected]
         with:
           submodules: true
 
@@ -191,7 +191,7 @@ jobs:
         working-directory: server
     steps:
       - name: Checkout
-        uses: actions/checkout@v3 # [email protected]
+        uses: actions/checkout@v4 # [email protected]
         with:
           submodules: true
 
@@ -251,7 +251,7 @@ jobs:
         working-directory: client
     steps:
       - name: Checkout
-        uses: actions/checkout@v3 # [email protected]
+        uses: actions/checkout@v4 # [email protected]
         with:
           submodules: true