update GH image and actions versions

Author: ivailop

.github/workflows/ci.yml

@@ -6,18 +6,16 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: '2.3'
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 50
+      - uses: actions/checkout@v3
       - uses: testspace-com/setup-testspace@v1
         with:
           domain: samples
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         with:
           path: vendor/bundle
           key: ${{ runner.os }}-gems-${{ hashFiles('Gemfile.lock') }}