add macos build to github actions job matrix

Author: astanin

.github/workflows/tabulate.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
-        os: ["ubuntu-latest", "windows-latest"]
+        os: ["ubuntu-latest", "windows-latest", "macos-latest"]
     runs-on: ${{ matrix.os }}
 
     steps: