chore(deps): update actions/checkout action to v4 (vkolgi#64)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/npm-publish.yml

@@ -10,7 +10,7 @@ jobs:
   publish-npm:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
           node-version: 16

.github/workflows/on-pull-request.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       # Run npm install, this also runs the tests (as part of prepare)
       - name: Install and run tests