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/test.yml

@@ -14,8 +14,8 @@ jobs:
     env:
       TEST_MOD_NAME: 'megapack'
     steps:
-    - uses: actions/checkout@v3 # clones this repo
-    - uses: actions/checkout@v3 # clones dependency
+    - uses: actions/checkout@v4 # clones this repo
+    - uses: actions/checkout@v4 # clones dependency
       with:
         clean: 'false'
         repository: 'megaglest/megaglest-data'
@@ -34,8 +34,8 @@ jobs:
     env:
       TEST_MOD_NAME: 'amazones'
     steps:
-    - uses: actions/checkout@v3 # clones this repo
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4 # clones this repo
+    - uses: actions/checkout@v4
       with:
         clean: 'false'
         repository: 'megaglest/megaglest-data'