Update test matrix schedule

Author: mleczakm

.github/workflows/unit-tests.yml

@@ -14,25 +14,11 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                include:
-                    # Lowest Deps
-                    - php: 8.1
-                      symfony: 5.4.*
-                      composer-flags: '--prefer-lowest --prefer-stable'
-                      can-fail: false
-                    # Stable deps
-                    - php: 8.2
-                      symfony: 6.3.*
-                      composer-flags: '--prefer-stable'
-                      can-fail: false
-                    - php: 8.2
-                      symfony: 6.4.*
-                      composer-flags: '--prefer-stable'
-                      can-fail: false
-                    - php: 8.2
-                      symfony: 7.0.*
-                      composer-flags: '--prefer-stable'
-                      can-fail: false
+                #Stable supported versions
+                php: ['8.1', '8.2', '8.3']
+                symfony: ['5.4.*', '6.4.*', '7.0.*']
+                composer-flags: ['--prefer-stable']
+                can-fail: [false]
 
         name: "PHP ${{ matrix.php }} - Symfony ${{ matrix.symfony }}${{ matrix.composer-flags != '' && format(' - Composer {0}', matrix.composer-flags) || '' }}"