chore: remove support for older Go versions in lint workflow

- Remove support for Go versions 1.18 and 1.19 in the lint workflow

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

Author: appleboy

.github/workflows/lint.yml

@@ -6,7 +6,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        go: [1.18, 1.19, "1.20", 1.21]
+        go: ["1.20", 1.21]
     name: ${{ matrix.os }} @ Go ${{ matrix.go }}
     runs-on: ${{ matrix.os }}