Update Maven version to 3.9.15 for copilot

Author: akurtakov

.github/workflows/copilot-setup-steps.yml

@@ -25,8 +25,8 @@ jobs:
           distribution: 'temurin'
           cache: 'maven'
 
-      - name: Set up Maven 3.9.12
+      - name: Set up Maven
         uses: stCarolas/setup-maven@12eb41b233df95d49b0c11fc1b5bc8312e5d4ce0 # v5.1
         with:
-          maven-version: '3.9.12'
+          maven-version: '3.9.15'