Remove --parallel flag

Author: marcusmoore

.github/workflows/tests-mysql.yml

@@ -76,4 +76,4 @@ jobs:
           DB_DATABASE: snipeit
           DB_PORT: ${{ job.services.mysql.ports[3306] }}
           DB_USERNAME: root
-        run: php artisan test --parallel
+        run: php artisan test

.github/workflows/tests-postgres.yml

@@ -74,4 +74,4 @@ jobs:
           DB_PORT: ${{ job.services.postgresql.ports[5432] }}
           DB_USERNAME: snipeit
           DB_PASSWORD: password
-        run: php artisan test --parallel
+        run: php artisan test

.github/workflows/tests-sqlite.yml

@@ -58,4 +58,4 @@ jobs:
       - name: Execute tests (Unit and Feature tests) via PHPUnit
         env:
           DB_CONNECTION: sqlite_testing
-        run: php artisan test --parallel
+        run: php artisan test