[CI] Updates Stack version in test matrices

Author: picandocodigo

.ci/test-matrix.yml

@@ -1,6 +1,6 @@
 ---
 STACK_VERSION:
-  - 8.2.0-SNAPSHOT
+  - 8.3.0-SNAPSHOT
 
 RUBY_TEST_VERSION:
 - 3.1

.github/workflows/main.yml renamed to .github/workflows/8.3.yml

@@ -2,10 +2,10 @@ name: main
 on:
   push:
     branches:
-      - main
+      - 8.3
   pull_request:
     branches:
-      - main
+      - 8.3
 jobs:
   test-main:
     env:
@@ -26,7 +26,7 @@ jobs:
         sudo sysctl -w vm.max_map_count=262144
     - uses: elastic/elastic-github-actions/elasticsearch@master
       with:
-        stack-version: 8.2.0-SNAPSHOT
+        stack-version: 8.3.0-SNAPSHOT
         security-enabled: false
     - uses: ruby/setup-ruby@v1
       with: