Set PYO3_USE_ABI3_FORWARD_COMPATIBILITY=1 to test Python 3.14

Author: hugovk

.github/workflows/test-suite.yml

@@ -7,6 +7,10 @@ on:
   pull_request:
 #    branches: ["master"]
 
+env:
+  FORCE_COLOR: 1
+  PYO3_USE_ABI3_FORWARD_COMPATIBILITY: 1  # To support Python 3.14
+
 jobs:
   tests:
     name: "Python ${{ matrix.python-version }}"