build(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](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/tests.yml

@@ -34,7 +34,7 @@ jobs:
 
     steps:
       - name: "Check out the repo"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Set up Python"
         id: "setup-python"
@@ -102,7 +102,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "Check out the repo"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Set up Python"
         uses: "actions/setup-python@v4"
@@ -150,7 +150,7 @@ jobs:
 
     steps:
       - name: "Check out the repo"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Set up Python"
         uses: "actions/setup-python@v4"
@@ -174,7 +174,7 @@ jobs:
 
     steps:
       - name: "Check out the repo"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Set up Python"
         uses: "actions/setup-python@v4"