CI: use newer versions of GH Actions

In order to avoid warnings output in CI screens.

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

.github/workflows/coverage.yaml

@@ -24,7 +24,7 @@ jobs:
           - "3.2"
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{matrix.ruby}}
@@ -34,7 +34,7 @@ jobs:
       timeout-minutes: 5
       run: bundle exec bake test
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v3
       with:
         name: coverage-${{matrix.os}}-${{matrix.ruby}}
         path: .covered.db
@@ -44,7 +44,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: "3.2"

.github/workflows/documentation.yaml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - uses: ruby/setup-ruby@v1
       with:
@@ -43,7 +43,7 @@ jobs:
       run: bundle exec bake utopia:project:static --force no
 
     - name: Upload documentation artifact
-      uses: actions/upload-pages-artifact@v1
+      uses: actions/upload-pages-artifact@v2
       with:
         path: docs
 
@@ -58,4 +58,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@v2

.github/workflows/test-external.yaml

@@ -25,7 +25,7 @@ jobs:
           - "3.2"
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{matrix.ruby}}

.github/workflows/test.yaml

@@ -39,7 +39,7 @@ jobs:
             experimental: true
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{matrix.ruby}}