Fix another typo in github actions

Author: excid3

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
       BUNDLE_PATH_RELATIVE_TO_CWD: true
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
@@ -92,7 +92,7 @@ jobs:
         options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
@@ -127,7 +127,6 @@ jobs:
           - rails_main
         exclude:
           # sqlite3 ~> 1.7 is not compatible with Ruby 3.4+
-            ruby: '3.4'
           - gemfile: rails_7_0
             ruby: '3.4'
           - gemfile: rails_7_1
@@ -141,15 +140,15 @@ jobs:
 
     services:
       postgres:
-        image: postgres:16
+        image: postgres:18
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: password
           POSTGRES_DB: test
         ports: ['5432:5432']
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1