ci: update Go versions in CI workflow configuration

- Remove Go versions `1.18` and `1.19` from the workflow configuration
- Retain only Go versions `1.20`, `1.21`, and `1.22`
- Delete the macOS build configuration from the jobs section

Signed-off-by: appleboy <[email protected]>

.github/workflows/go.yml

@@ -28,12 +28,10 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        go: [1.18, 1.19, "1.20", 1.21, 1.22]
+        go: ["1.20", 1.21, 1.22]
         include:
           - os: ubuntu-latest
             go-build: ~/.cache/go-build
-          - os: macos-latest
-            go-build: ~/Library/Caches/go-build
     name: ${{ matrix.os }} @ Go ${{ matrix.go }}
     runs-on: ${{ matrix.os }}
     env: