[CI] Updates CI test matrix for 8.2

Author: picandocodigo

.github/workflows/main.yml renamed to .github/workflows/8.2.yml

@@ -1,11 +1,11 @@
-name: main
+name: 8.2
 on:
   push:
     branches:
-      - main
+      - 8.2
   pull_request:
     branches:
-      - main
+      - 8.2
 jobs:
   test-main:
     env:
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '2.6', '2.7', '3.0', '3.1', 'jruby-9.3' ]
+        ruby: [ '2.7', '3.0', '3.1', 'jruby-9.3' ]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -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: 8.2-SNAPSHOT
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}