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](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.yaml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Testing streamr-docker-dev-action
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ./
     - run: curl -v http://localhost/api/v1/products
       shell: bash

action.yaml

@@ -16,7 +16,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         repository: streamr-dev/streamr-docker-dev
         ref: ${{ inputs.branch }}