ci: update GitHub actions to use Node.js v20

Update actions/checkout and actions/setup-node to the latest versions,
using Node.js v20.

This change removes the multiple warnings from the GitHub run view:

> The following actions uses node12 which is deprecated and will be forced
> to run on node16: actions/checkout@v2, actions/setup-node@v1. For more info:
> https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

In addition, remove `registry-url` parameter from the second `setup-node`,
because it equals the default value.

.github/workflows/npm.yml

@@ -22,8 +22,8 @@ jobs:
           - "qase-playwright"
           - "qase-testcafe"
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@v1
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
       with:
         node-version: ${{ matrix.node-version }}
     - working-directory: ./${{ matrix.prefix }}
@@ -49,12 +49,11 @@ jobs:
         - "qase-testcafe"
     if: startsWith(github.event.ref, 'refs/tags')
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-node@v1
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
       if: contains(github.event.ref, matrix.prefix)
       with:
         node-version: '16'
-        registry-url: 'https://registry.npmjs.org'
     - if: contains(github.event.ref, matrix.prefix)
       working-directory: ./${{ matrix.prefix }}
       run: npm install