Update tests.yml

Author: johnnynunez

.github/workflows/tests.yml

@@ -12,8 +12,8 @@ jobs:
 
     strategy:
       fail-fast: false
-      arch: [x86_64]
       matrix:
+        arch: [x86_64]
         include:
           # UBUNTU 22.04 - CASTXML EPIC 0
           - os: ubuntu-22.04
@@ -175,4 +175,4 @@ jobs:
       - name: Run tests
         run: |
           export PATH=~/castxml/bin:$PATH
-          pytest tests
+          pytest tests