fix: use --break-system-packages for pip3 on macOS runner (PEP 668)

Author: fullstackjam

.github/workflows/test.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Contract schema validation
         run: |
           git clone --depth 1 https://github.com/openbootdotdev/openboot-contract.git /tmp/contract
-          pip3 install jsonschema
+          pip3 install --break-system-packages jsonschema
 
           python3 -c "
           import json, jsonschema, sys