Add tests against php 8 and 8.1 for elasticsearch 5

Author: alexander-schranz

.github/workflows/test-application.yaml

@@ -22,6 +22,18 @@ jobs:
                       symfony-version: '^3.4'
                       elasticsearch-package-constraint: '^5.0'
 
+                    - php-version: '8.0'
+                      elasticsearch-version: '5.6.14'
+                      lint: true
+                      symfony-version: '^4.4'
+                      elasticsearch-package-constraint: '^5.0'
+
+                    - php-version: '8.1'
+                      elasticsearch-version: '5.6.14'
+                      lint: true
+                      symfony-version: '^5.4'
+                      elasticsearch-package-constraint: '^5.0'
+
                     - php-version: '7.4'
                       elasticsearch-version: '7.11.1'
                       lint: false