remove pre 0.14.0 CI workflows

Author: Techatrix

.github/workflows/ci.yaml

@@ -17,9 +17,7 @@ jobs:
         zig-version: [master]
         os: [ubuntu-latest, macos-latest, windows-latest]
         include:
-          - zig-version: "0.12.1"
-            os: ubuntu-latest
-          - zig-version: "0.13.0"
+          - zig-version: "0.14.0"
             os: ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps: