Detect Go version for integration tests

Linear issue tracker: https://linear.app/expanso/issue/ENG-263/explore-testcontainers-to-utilize-in-testing-strategy
Github Issue: #4597

.github/workflows/testcontainers-integration-tests.yml

@@ -15,10 +15,19 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      # Detect Go version from test_integration/go.mod
+      - name: Detect Go version from test_integration/go.mod
+        id: detect-test-go-version
+        run: |
+          go_version=$(grep '^go ' test_integration/go.mod | awk '{print $2}')
+          echo "Go version detected for integration tests: $go_version"
+          echo "GOLANG_TEST_VERSION=$go_version" >> $GITHUB_ENV
+
       - name: Set up Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
-          go-version: '1.23'
+          go-version: ${{ env.GOLANG_TEST_VERSION }}
+          cache: true
 
       - name: Run Go tests in integration test directory
         run: |