tests: use phpunit 8 to support PHP 7.2, unify test DB name

Author: bolner

.github/workflows/php.yml

@@ -47,9 +47,9 @@ jobs:
 
     - name: Create database
       run: |
-          sudo -u monetdb monetdb create temp
-          sudo -u monetdb monetdb release temp
-          sudo -u monetdb monetdb start temp || true
+          sudo -u monetdb monetdb create myDatabase
+          sudo -u monetdb monetdb release myDatabase
+          sudo -u monetdb monetdb start myDatabase || true
 
     - name: Run Unit-Tests
       run: |

Examples/DataModification/composer.lock

@@ -27,6 +27,6 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "^9"
+        "phpunit/phpunit": "^8"
     }
 }