Remove duplicate integration tests from matrix

These lines should be unnecessary if the intent was to test the latest versions of MacOS and Ubuntu; they are already in the matrix via lines above.

Author: angelapwen

.github/workflows/ci.yml

@@ -29,10 +29,6 @@ jobs:
         os: [ubuntu-latest, macos-latest]
         swift: ["5.10"]
         include:
-        - os: macos-12
-          swift: "5.10"
-        - os: ubuntu-22.04
-          swift: "5.10"
         - os: windows-latest
           swift: "5.6.3"
     steps: