[CI] Updates stack version

Author: picandocodigo

.ci/test-matrix.yml

@@ -1,6 +1,6 @@
 ---
 STACK_VERSION:
-  - 8.7.0-SNAPSHOT
+  - 8.7-SNAPSHOT
 
 RUBY_TEST_VERSION:
 - 3.2

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
         sudo sysctl -w vm.max_map_count=262144
     - uses: elastic/elastic-github-actions/elasticsearch@master
       with:
-        stack-version: 8.7.0-SNAPSHOT
+        stack-version: 8.7-SNAPSHOT
         security-enabled: false
     - uses: ruby/setup-ruby@v1
       with:

.github/workflows/unified-release.yml

@@ -18,7 +18,7 @@ jobs:
     name: Assemble
     runs-on: ubuntu-latest
     env:
-      stack-version: 8.6.0-SNAPSHOT
+      stack-version: 8.7-SNAPSHOT
     steps:
       - name: Checkout
         uses: actions/checkout@v2