upgrade go version to 1.20and add more go version for linux ci.

Signed-off-by: Lan Liang <gcslyp@gmail.com>

.github/workflows/main_darwin.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.18
+          go-version-file: 'go.mod'
 
       - run: go version
       - run: go env

.github/workflows/main_linux.yml

@@ -11,15 +11,18 @@ on:
 jobs:
   build-and-test:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: [ '1.20', '1.21', '1.22', '1.23' ]
     steps:
       - name: Git checkout
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - name: Set up Go 1.18
+      - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.18
+          go-version: ${{ matrix.go-version }}
       - run: go version
       - run: go env
       - run: go test ./...

.github/workflows/main_windows.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: 1.18
+          go-version-file: 'go.mod'
 
       - run: go version
       - run: go env

.github/workflows/release.yml

@@ -16,10 +16,10 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - name: Set up Go 1.18
+      - name: Set up Go
         uses: actions/setup-go@v5
         with:
-            go-version: 1.18
+           go-version-file: 'go.mod'
       - run: go version
       - run: go env
       - run: go test ./...

go.mod

@@ -1,6 +1,6 @@
 module kcl-lang.io/kcl-openapi
 
-go 1.18
+go 1.20
 
 require (
 	github.com/go-openapi/analysis v0.21.2