Adjusted maven publish workflow to execute automatically when merging…

… a PR. (opensearch-project#1531) (opensearch-project#1532)

(cherry picked from commit 7ee7915)

Signed-off-by: AWSHurneyt <hurneyt@amazon.com>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

.github/workflows/maven-publish.yml

@@ -3,11 +3,10 @@ name: Publish snapshots to maven
 on:
   workflow_dispatch:
   push:
-    branches: [
-        main
-          1.*
-          2.*
-    ]
+    branches:
+      - main
+      - '[0-9]+.[0-9]+'
+      - '[0-9]+.x'
 
 jobs:
   build-and-publish-snapshots: