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] <support@github.com>

.github/workflows/dokku.yml

@@ -36,7 +36,7 @@ jobs:
       url: https://manga.gachimuchi.men
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - id: deploy

.github/workflows/tests.yml

@@ -46,7 +46,7 @@ jobs:
           --health-retries 5
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     # Force https use since ssh does not work
     - run: 'git config --global url."https://github.com/".insteadOf ssh://git@github.com/'
     - run: 'git config --global url."https://".insteadOf ssh://'
@@ -128,7 +128,7 @@ jobs:
           - 9200:9200
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: pnpm/action-setup@v2
         with:
           version: 8
@@ -220,7 +220,7 @@ jobs:
           --health-retries 5
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # Force https use since ssh does not work
       - run: 'git config --global url."https://github.com/".insteadOf ssh://git@github.com/'
       - run: 'git config --global url."https://".insteadOf ssh://'