[CI] Updates GitHub Actions

Author: picandocodigo

.github/workflows/8.x.yml renamed to .github/workflows/8.18.yml

@@ -1,11 +1,11 @@
-name: 8x
+name: 8.18
 on:
   push:
     branches:
-      - 8.x
+      - 8.18
   pull_request:
     branches:
-      - 8.x
+      - 8.18
 jobs:
   test-main:
     env:
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '3.1', '3.2', '3.3', '3.4', 'jruby-9.3', 'jruby-9.4' ]
+        ruby: ['3.1', '3.2', '3.3', '3.4', 'jruby-9.3', 'jruby-9.4']
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4